One of Us Is Back Summary and Study Guide

Name: One of Us Is Back
Author: Karen M. McManus

⚠️ Spoiler Warning: This guide contains detailed spoilers for the entire novel. Proceed only if you've finished reading or are comfortable knowing the plot.

You can read the chapter-by-chapter summaries for a spoiler-free overview instead.

For a quick recap, see the short summary below, or jump to the full summary for a detailed walkthrough.

If you're looking for specific answers, check the common questions section.

For deeper analysis, explore the themes, symbols, and ending explained pages.

You can also test your knowledge with the quiz or use the essay prompts for further study.

For direct answers to common reader questions, see the questions and answers page.

For a full list of characters, visit the character pages.

For a complete breakdown of every chapter, see the chapter table below.

For a quick reference, here are the quick facts.

For a concise overview, read the short summary.

For a detailed plot recap, read the full summary.

For a look at the main players, see main characters.

For the big ideas, see themes.

For recurring objects and motifs, see symbols.

For how it all wraps up, see ending overview.

For a chapter-by-chapter breakdown, see the chapter table.

For common questions, see common questions.

For links to deeper pages, see dive deeper.

Now, let's dive in.

Quick Facts

Field	Detail
Title	One of Us Is Back
Author	Karen M. McManus
Series	One of Us Is Lying (Book 3)
Publication Year	2023
Genre	Young adult mystery/thriller
Setting	Bayview, a fictional town in California (including Bayview High, Café Contigo, and the Bayview Country Club)
Narrator	Third-person limited, alternating among multiple characters (e.g., Addy, Phoebe, Nate)

Short Summary

One of Us Is Back returns to Bayview as Jake Riordan, the boy who helped frame Addy for murder and attacked her, is released from juvenile detention after a juror misconduct scandal forces a new trial. The Bayview Crew—Addy, Nate, Bronwyn, Maeve, Cooper, and their friends—brace for his return, but a new threat emerges: a hacked billboard and flyers announce a deadly game. Phoebe is drugged and kidnapped, found with the word “Practice” on her arm. Reggie Crawley is later found dead with “Makes” written on his. The group investigates, uncovering the Alton family’s tragic past and the “Practice Makes Perfect” slogan from an old ad campaign. The culprit is Chelsea Alton, who has been posing as Evie, and her boyfriend Gavin. Chelsea seeks revenge for her father’s death, which she blames on Jake. The climax sees Chelsea hold Jake captive, shoot him, and escape with Gavin. The book ends with the group healing, Owen’s secret revealed, and Addy finding closure.

Full Summary

The novel opens on Monday, June 22, with Addy, Maeve, and Bronwyn watching a televised Eastland High Summer Seminar where Jake Riordan, now a model prisoner, speaks about his rehabilitation. Addy is haunted by the glint in his eye that suggests he’s not truly remorseful. Meanwhile, Phoebe attends the same event, hiding her crush on Jake and her family’s secrets. Nate discovers a billboard and flyer announcing “Time for a New Game, Bayview,” and learns that Jake is coming home.

Jake’s release is due to juror misconduct by Marshall Whitfield, who leaked trial information. The Bayview Crew is on edge. Phoebe’s car gets a flat tire, and Jake helps her, leaving her uneasy. At Nate’s Fourth of July party, Phoebe drinks too much, and after a confrontation with Reggie, she stumbles outside and is drugged and kidnapped. The next day, the group finds her phone but not her. They eventually discover Phoebe in a shed at Bayview High, with “Practice” written on her arm.

As Phoebe recovers, the group investigates. Maeve digs into the revenge forum, and they learn about the Alton family. Alexander Alton, a former managing director at the ad agency Conrad and Olsen, drowned years ago. His son Chase is a suspect, but he has an alibi. The group also notices a red convertible stalking them, later revealed to belong to Marshall Whitfield.

Reggie Crawley goes missing, and Nate, Bronwyn, and Nate’s father find him dead in the boys’ locker room, with “Makes” on his arm. The phrase “Practice Makes Perfect” becomes a clue. Vanessa Merriman, who has been trying to make amends, recognizes it as an old SAT tutoring campaign by Conrad and Olsen, where Jake’s mother worked.

Phoebe’s brother Owen is revealed to have been involved in the earlier Truth or Dare game that led to Brandon’s death. Phoebe and Emma had covered for him. Owen’s guilt surfaces, and they decide to tell their mother. Meanwhile, Phoebe discovers that Evie, her coworker at Café Contigo, has green vine wallpaper in her apartment matching what she saw during her kidnapping. She confronts Evie, who is actually Chelsea Alton.

Chelsea and her boyfriend Gavin have been orchestrating the crimes. Chelsea’s father, Alexander Alton, was killed by Jake, she believes, and she wants revenge. She hacked the billboard, drugged Phoebe (mistaking her for Vanessa), and killed Reggie accidentally. She and Gavin kidnap Addy and Jake, planning to frame Addy for Jake’s murder. At the climax, Cooper and Luis arrive to rescue them. Chelsea shoots Jake, and she and Gavin escape.

In the aftermath, Jake is dead. Chelsea leaves notes taking responsibility. Owen’s involvement becomes public, but transcripts show he lacked intent, and public sympathy shifts. The group heals. Nate proposes to Bronwyn. Addy burns a photo of her and Jake, finding closure. Phoebe and Knox reconcile. The book ends with Addy preparing to leave for Peru, carrying a note about her unborn niece, Iris Adelaide.

Main Characters

Addy – A Bayview survivor who, while dealing with Jake’s release and a new romance with Keely, becomes a key investigator in Phoebe’s disappearance and ultimately confronts the culprits Chelsea and Gavin.
Nate – A loyal friend and Bronwyn’s boyfriend who, despite his father’s past and Jake’s provocations, helps search for Phoebe and Reggie, survives an attack by Gavin, and ends the book proposing to Bronwyn.
Phoebe – A new member of the Bayview group who, after being mistakenly drugged and kidnapped by Chelsea, must confront her family’s secrets and help uncover the truth about the crimes.
Bronwyn – The group’s researcher who, while home from Yale, investigates the Alton family and the revenge forum, and helps search for Phoebe and Reggie, while also being Nate’s longtime love.
Maeve – Addy’s sister and a tech-savvy investigator who uses her online skills to track the revenge forum and uncover the Alton family’s secrets, while also supporting her friends.
Cooper – A loyal friend who, despite his own struggles, helps search for Phoebe and Reggie, rescues Phoebe from Chelsea’s house, and ends the book planning a future with Kris.

Themes

Performative remorse and the mask of rehabilitation – The book explores how a convicted criminal can project a facade of remorse and reform to manipulate public perception, while his true intentions remain hidden.
The cycle of revenge and its collateral damage – The narrative examines how past wrongs and a desire for vengeance can spiral into a new wave of crimes, harming innocent people along the way.
The weight of family secrets and the cost of concealment – The story shows how hidden truths within families, kept to protect loved ones, can fester and lead to greater harm and betrayal.
The failure of institutional justice and the search for personal justice – The book critiques the legal system’s inability to deliver true justice, prompting characters to take matters into their own hands.
Identity deception and the danger of hidden pasts – The plot revolves around characters who assume false identities and conceal their histories, leading to dangerous consequences for the community.

Symbols

Practice Makes Perfect messages – A recurring motif where the killer writes fragments of the phrase “Practice Makes Perfect” on victims’ arms, linking the crimes to an old advertising campaign.
Green vine wallpaper – A recurring visual clue that Phoebe remembers from her kidnapping and later finds in Evie’s apartment, identifying the kidnapper’s hideout.
Red convertible – A recurring car that appears near key locations and is later revealed to belong to Marshall Whitfield, signaling surveillance and stalking.
Hacked billboard and flyers – A recurring advertising motif that announces the “new game” and later the “Practice Makes Perfect” slogan, tying to the revenge plot.

Ending Overview

The ending sees Chelsea Alton shoot Jake Riordan, killing him, after holding him captive. Chelsea and Gavin escape, leaving behind notes taking responsibility for the crimes. Phoebe, who was also held captive, is rescued by Cooper and Luis. Nate is hospitalized but recovers. Owen’s involvement in the earlier Truth or Dare game is revealed, but transcripts show he lacked intent, and public sympathy shifts. The group begins to heal: Nate proposes to Bronwyn, Addy burns a photo of her and Jake and finds closure, and Phoebe and Knox reconcile. Addy prepares to leave for Peru, carrying a note about her unborn niece, Iris Adelaide.

Chapter Table

Chapter	Title	Summary
1	Other Titles	Front matter listing the author’s other books.
2	Chapter One	Addy watches Jake’s televised talk; Phoebe attends the same event.
3	Chapter Two	Phoebe lies about her whereabouts; Nate sees a billboard about a new game.
4	Chapter Three	Nate learns Jake is coming home; Phoebe’s car gets a flat tire.
5	Chapter Four	Addy and Cooper pick up restraining order paperwork; Phoebe has a tense encounter with Jake.
6	Chapter Five	Phoebe works at Café Contigo; Jake helps her with a flat tire.
7	Chapter Six	Nate’s roommates vote to let Reggie stay; Jake is seen at Bayview High.
8	Chapter Seven	Addy shops with Ashton; a billboard is hacked.
9	Chapter Eight	At Nate’s party, Phoebe drinks and is later drugged and kidnapped.
10	Chapter Nine	The group realizes Phoebe is missing.
11	Chapter Ten	They search for Phoebe and find her phone.
12	Chapter Eleven	Police investigate; Addy spots a red convertible.
13	Chapter Twelve	Phoebe is found in a shed with “Practice” on her arm.
14	Chapter Thirteen	Phoebe copes with the aftermath; Cooper offers catharsis.
15	Chapter Fourteen	The group discusses clues; Maeve investigates the revenge forum.
16	Chapter Fifteen	Nate confronts Jake at the country club.
17	Chapter Sixteen	Bronwyn goes missing briefly; they fear Jake took her.
18	Chapter Seventeen	They drive to Jake’s vacation house; Bronwyn is found safe.
19	Chapter Eighteen	They photograph the wallpaper at Jake’s house; Jake threatens Addy.
20	Chapter Nineteen	Phoebe and Maeve discuss the wallpaper; Cooper considers a new car.
21	Chapter Twenty	Phoebe confesses to Knox about Owen’s involvement.
22	Chapter Twenty-one	Nate learns Jake is banned from the club; Reggie is missing.
23	Chapter Twenty-two	Nate, Bronwyn, and Patrick find Reggie dead with “Makes” on his arm.
24	Chapter Twenty-three	Addy receives a baby envelope; Keely calls.
25	Chapter Twenty-four	The group discusses the “Practice Makes Perfect” clue; Vanessa recognizes it.
26	Chapter Twenty-five	Phoebe visits Conrad & Olsen; learns about the Alton family.
27	Chapter Twenty-six	Maeve investigates Alexander Alton’s death; Chase Alton is a suspect.
28	Chapter Twenty-seven	Addy confronts Marshall Whitfield; Jake disappears.
29	Chapter Twenty-eight	The group discusses Jake’s disappearance; Phoebe finds Reggie’s necklace in Owen’s bag.
30	Chapter Twenty-nine	Nate’s father gives him money; Vanessa reveals Ms. Riordan’s affair.
31	Chapter Thirty	Addy reconciles with her mother; Maeve discovers Chelsea’s fake Instagram.
32	Chapter Thirty-one	Phoebe and Emma confront Owen; he confesses his role in the Truth or Dare game.
33	Chapter Thirty-two	Phoebe finds Evie’s apartment with green vine wallpaper; realizes Evie is involved.
34	Chapter Thirty-three	Nate learns Evie is Chelsea Alton; Gavin is her accomplice.
35	Chapter Thirty-four	Gavin attacks Nate and kidnaps Addy.
36	Chapter Thirty-five	Phoebe wakes up tied to a chair; Chelsea reveals her plan.
37	Chapter Thirty-six	Gavin brings Addy to the house; Chelsea holds Jake captive.
38	Chapter Thirty-seven	Chelsea explains her revenge plan; Jake is tied up.
39	Chapter Thirty-eight	Chelsea shoots Jake; Cooper and Luis arrive.
40	Chapter Thirty-nine	Phoebe is rescued; Jake is dead.
41	Chapter Forty	Three days later, Phoebe visits Nate in the hospital; Owen’s story becomes public.
42	Chapter Forty-one	Nate and Addy attend a party; Nate proposes to Bronwyn.
43	Chapter Forty-two	Addy burns a photo of Jake and finds closure.

Common Questions

1. Who is the killer in One of Us Is Back?

The main culprits are Chelsea Alton (posing as Evie) and her boyfriend Gavin Barrett. Chelsea orchestrates the crimes to avenge her father’s death, which she blames on Jake Riordan.

2. What happens to Jake Riordan?

Jake is released from juvenile detention due to a new trial, but he is later kidnapped by Chelsea and Gavin. Chelsea shoots and kills him in the climax.

3. What is the “Practice Makes Perfect” clue?

It’s a slogan from an old SAT tutoring campaign by the ad agency Conrad and Olsen. The killer writes fragments of the phrase on victims’ arms.

4. Why does Phoebe get kidnapped?

Phoebe was not the intended target. Chelsea had drugged a drink meant for Vanessa Merriman, but Phoebe accidentally drank it. After Phoebe confessed to Owen’s involvement in the Truth or Dare game, Chelsea switched targets to Phoebe.

5. What is the significance of the green vine wallpaper?

Phoebe remembers seeing it during her kidnapping. She later finds the same wallpaper in Evie’s apartment, which reveals Evie’s true identity as Chelsea Alton.

6. How does the book end?

Chelsea kills Jake and escapes with Gavin. The group heals: Nate proposes to Bronwyn, Addy finds closure, and Phoebe reconciles with Knox.

7. What is Owen’s role in the story?

Owen was involved in the earlier Truth or Dare game that led to Brandon’s death. He was manipulated by Jared Jackson. His secret is revealed, but transcripts show he lacked intent, and public sympathy shifts.

8. Does Addy end up with anyone?

Addy is in a new romance with Keely, who supports her. The book ends with Addy planning to travel to Peru, and she is not in a committed relationship at the end.

Dive Deeper

Chapter Summaries: Chapter 1 through Chapter 43
Characters: Addy,