Killers of a Certain Age: A Complete Book Guide and Chapter Summary

Name: Kills Well with Others
Author: Deanna Raybourn

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

Quick Facts

Short Summary

Four retired assassins—Billie, Helen, Mary Alice, and Natalie—are pulled from their quiet lives when a past mission resurfaces. An obsidian wolf figurine left with a murdered former colleague signals that someone is avenging the 1979 killing of Boris Lazarov. The women reunite to hunt Lazarov’s son Pasha aboard the Queen Mary 2, but soon discover the threat is bigger: Pasha’s sister Galina is alive and wants revenge. The chase leads from England to Sardinia, Switzerland, Venice, and finally a Balkan train, where they confront a traitor within their own organization and recover a stolen Raphael painting. The novel explores aging, loyalty, chosen family, and the meaning of being “necessary monsters.”

Full Summary

Killers of a Certain Age opens with an Author’s Note in which Deanna Raybourn playfully warns readers that she lies—some details are true, others invented. The story then flashes back to April 1982, where the four women—Billie, Helen, Natalie, and Mary Alice—are undercover as Playboy Bunnies in Chicago, planning to kill a gangster’s nephew by replacing his EpiPen with a lethal injection. The plan fails when the nephew spills his drink and the backup dose breaks. A furious Billie abandons protocol, goes to his hotel alone, and kills a man in the dark—only to discover she has murdered the wrong person.

The narrative jumps forward to the present day. Billie leaves her lover Taverner on a Greek island and flies to Washington, D.C., to reunite with her former squadmates. They are summoned to Colonial Williamsburg by Naomi Ndiaye, a former colleague, who reveals that Lilian Flanders—a Provenance agent who helped them kill Boris Lazarov in 1979—has been suffocated. An obsidian wolf carved with Lazarov’s initials was left with her body. Naomi suspects Lazarov’s son Pasha is avenging his father and gives the team a dead drop with intelligence. The women board the Queen Mary 2 to assassinate Pasha.

After days of surveillance, Billie kills Pasha by drowning him in his bathtub and staging a heart attack. She impulsively steals his diary, breaking procedure. After disembarking, they discover that Helen’s house, Benscombe, has been burned down—arson marked by another obsidian wolf. Billie realizes Pasha had a backup: his sister Galina, who faked her death years earlier. The team flees to a safe house in Sardinia, joining allies Taverner, Minka, and Akiko.

From Sardinia, they travel to Switzerland to interrogate Pasha’s elderly aunt Evgenia, who reveals Galina is alive. Billie confesses to stealing the diary, which contains a Venetian phone number. In Venice, they trace Galina through opera singer Wolfgang Praetorius. Billie poses as a Met recruiter to lure Wolfgang, but when she reveals her true purpose, he panics and flees. Galina ambushes them at a palazzo; Wolfgang is shot, but the team escapes by boat, killing one of Galina’s men in the process.

They regroup and interrogate Wolfgang, who reveals Galina is after a “very important deal” in Montenegro. Minka hacks Galina’s email and finds a train itinerary from Podgorica to Athens. The women deduce the prize is the same Raphael painting, Leda and the Swan, that they failed to recover in 1994 from Nazi-looted art dealer Fermín Bosque. They board a Balkan train and find a decapitated courier with a Nazi inventory code. Helen realizes the person Galina is meeting is the mole inside the Museum—their old handler, Leda.

The final confrontation occurs on the speeding train. Billie identifies the mole as Marilyn Carstairs, a Provenance agent who orchestrated the heist for the Raphael painting. Galina, Tamara, and Marilyn are cornered. Natalie is kicked from the train and presumed dead. In a brutal fight, Billie kills Galina by dragging her out the door into a gorge. Mary Alice attacks Tamara; Helen recovers the painting from Marilyn’s backpack. The women jump from the train onto a mountain slope and survive. After a night trek, they are rescued by Natalie, who is alive and bruised.

They meet Naomi in Montenegro, hand over the painting and Pasha’s planner for repatriation, and negotiate official retirement. Taverner appears on a motorcycle; Billie rides away with him. The epilogue takes place in Venice, where the four women visit the Peggy Guggenheim Collection and view Leonor Fini’s Shepherdess of the Sphinxes. They toast Constance Halliday and themselves as “necessary monsters.” Helen hints at a relationship with Naomi and plans to rebuild Benscombe. The story ends with the women embracing their identity as killers who have earned their peace.

Main Characters

Billie Webster – The protagonist and leader of the team. She is a veteran assassin who struggles with a past mistake (killing the wrong man in 1982) and rekindles her romance with Taverner during the mission.
Helen – A white-haired, sober former squad mate whose house is burned down by Galina. She reveals a relationship with a younger Belgian man and later hints at growing close to Naomi.
Mary Alice Tuttle – A married assassin who shows fierce loyalty and a violent side when defending her teammates, notably attacking Tamara after Natalie is thrown from the train.
Natalie Schuyler – An eccentric artist and assassin whose creativity aids the team (e.g., phone scams, smoke bombs). She survives a fall from the speeding train and is reunited with the group.
Taverner – Billie’s former lover who reconnects with her. He provides a safe house in Sardinia and emotional support, eventually riding off with Billie at the story’s end.
Galina Lazarov – The vengeful daughter of Boris Lazarov who faked her death to avenge her family. She is the main antagonist, ultimately killed by Billie on the train.
Naomi Ndiaye – A former colleague who initially briefs the team and later helps them secure retirement. She is married to a theoretical physicist and has a child.
Constance Halliday – The mentor of the four women, known as the “Shepherdess.” She coined the phrase “necessary monsters” and asked Billie to assist her assisted suicide in 1986.
Marilyn Carstairs – The mole inside the Museum’s Provenance department. Feeling overlooked, she orchestrated the theft of the Raphael painting and used the Lazarovs for muscle.

Themes

Aging and Competence – The women leverage their experience and the invisibility of being underestimated to outmaneuver younger enemies, proving that age is an asset.
Loyalty and Chosen Family – The deep bond among the four assassins drives them to risk everything for each other, forming a family beyond blood ties.
Deception and Disguise – The characters constantly adopt false identities—from Playboy Bunnies to elderly patients—to accomplish their missions, highlighting the power of performance.
Revenge and Justice – Galina’s quest for revenge against the assassins drives the plot, while the team also pursues their own sense of justice, particularly regarding the Nazi-looted painting.
Art and Legacy – The stolen Raphael painting Leda and the Swan ties the plot to Nazi looted art and the preservation of cultural heritage, acting as a symbol of unfinished business and historical trauma.

Symbols

Obsidian Wolf – A carved wolf figurine left at crime scenes as a calling card, symbolizing the Lazarov family’s vengeance. The wolf also references Boris’s name (meaning “wolf” in Russian).
Raphael’s Leda and the Swan – A priceless painting that the team failed to recover in 1994 and becomes the prize in the current conflict. It represents unfinished business, Nazi looting, and the moral ambiguity of their profession.
“Necessary Monsters” – A phrase coined by Constance Halliday and embraced by the women as a justification for their lethal profession. It appears in multiple chapters and frames their identity.
Shepherdess of the Sphinxes – Leonor Fini’s painting viewed at the Peggy Guggenheim Collection. The women use it to honor Constance and themselves as protectors of a fragile humanity.

Ending Overview

The novel concludes with the elimination of Galina, Tamara, and Marilyn. Natalie survives her fall and reunites with the team. The women hand over the recovered Raphael painting and Pasha’s diary to Naomi, securing their retirement, bonuses, and pensions. Billie leaves with Taverner on a motorcycle, achieving closure on both the mission and their personal relationship. The final scene in Venice shows the four women viewing Shepherdess of the Sphinxes and toasting Constance Halliday, affirming their identity as “necessary monsters” who have earned their peace.

Chapter-by-Chapter Summary

Chapter	Title	Summary
Author’s Note	–	Raybourn admits some elements are true and some invented, setting a metafictional tone.
1	Chapter One	April 1982: Undercover as Bunnies, Billie kills the wrong man after a botched EpiPen plan.
2	Chapter Two	Billie leaves Taverner, reunites with Helen, Mary Alice, Natalie; suspicious cheap travel to Williamsburg.
3	Chapter Three	Naomi reveals Lilian Flanders’ murder and the obsidian wolf; team retrieves a dead drop on Pasha Lazarov.
4	Chapter Four	Team reviews dossier on Pasha; they decide to board the Queen Mary 2 to kill him.
5	Chapter Five	The women disguise themselves and board the QM2; they spot Pasha with a teddy bear.
6	Chapter Six	June 1982 flashback: Infiltrating a children’s party, Constance has a stroke, Billie kills Isabel with a corkscrew.
7	Chapter Seven	On the QM2, team surveils Pasha; Billie senses something wrong but proceeds with plan.
8	Chapter Eight	Helen reveals her lover Benoit; Billie shares the kill plan; their friendship deepens.
9	Chapter Nine	Team sedates bodyguard, Billie drowns Pasha in the bathtub, steals his diary.
10	Chapter Ten	After disembarking, they discover Helen’s house Benscombe is burning.
11	Chapter Eleven	Arson confirmed with another obsidian wolf; team flees to Sardinia via ferry and train.
12	Chapter Twelve	Gathering at Sardinian safe house: Akiko, Minka, Taverner join; Billie reflects on identity.
13	Chapter Thirteen	Billie calls Naomi under fire; they learn of Aunt Evgenia in Switzerland and decide to go.
14	Chapter Fourteen	1986 flashback: Billie assists Constance’s assisted suicide; “necessary monsters” philosophy.
15	Chapter Fifteen	Team infiltrates Swiss retirement home; Aunt Evgenia reveals Galina is alive.
16	Chapter Sixteen	Billie confesses stealing diary; Minka identifies Venetian phone number; they plan to go to Venice.
17	Chapter Seventeen	In Venice, team dislikes flashy house; they discover Aunt Evgenia’s obituary taunting them; plan extortion.
18	Chapter Eighteen	Billie and Mary Alice surveil opera house; Natalie devises phone scam to lure Wolfgang.
19	Chapter Nineteen	Billie poses as Met recruiter, reveals truth to Wolfgang; he flees across Rialto Bridge.
20	Chapter Twenty	Helen and Billie talk on balcony; Wolfgang calls back, agrees to meet; team suspects trap.
21	Chapter Twenty-One	Ambush at Scala Contarini del Bovolo; team escapes by boat; Billie kills a goon under a bridge.
22	Chapter Twenty-Two	1994 flashback: Briefing on Nazi-looted art dealer Fermín Bosque and Raphael painting.
23	Chapter Twenty-Three	Billie stitches Wolfgang’s ear; he agrees to cooperate after team convinces him.
24	Chapter Twenty-Four	Wolfgang reveals Galina’s deal in Montenegro; Minka finds train itinerary; team deduces mole.
25	Chapter Twenty-Five	1994 flashback: Billie kills Bosque in a hidden cave but the Raphael is missing.
26	Chapter Twenty-Six	Team boards Balkan train; find a decapitated courier with Nazi inventory code; Helen identifies Leda.
27	Chapter Twenty-Seven	Billie decodes the painting as the Raphael; they deduce Marilyn Carstairs is the mole; confrontation begins.
28	Chapter Twenty-Eight	Confrontation on train: Marilyn revealed as mastermind; Natalie is kicked out the window.
29	Chapter Twenty-Nine	Mary Alice attacks Tamara; Billie kills Galina by dragging her out of the train.
30	Chapter Thirty	Helen recovers painting; team jumps from train and survives; Natalie is reunited.
31	Chapter Thirty-One	Naomi arrives; team returns painting and planner; negotiate retirement; Billie leaves with Taverner.
32	Chapter Thirty-Two	Venice epilogue: visiting Peggy Guggenheim; toasting “necessary monsters”; Helen hints at relationship with Naomi.

Frequently Asked Questions

What is the significance of the obsidian wolf? The obsidian wolf is a calling card left by the Lazarovs. Carved with Boris’s initials, it represents vengeance and the family’s determination to avenge his death.
Why did Billie kill the wrong man in the opening chapter? She acted on anger after the EpiPen plan failed, broke protocol by working alone, and misidentified her target in the dark—a mistake that haunts her throughout the novel.
How does the theme of aging affect the assassins’ methods? The women use their age as a disguise, being underestimated by younger enemies. They leverage experience and invisibility to outmaneuver threats, turning a perceived weakness into a superpower.
What is the “necessary monsters” philosophy? Coined by Constance Halliday, it justifies their lethal work as a small evil to preserve a greater good. The women embrace this identity, seeing themselves as protectors of humanity.
Who is the mole in the Museum? Marilyn Carstairs, a Provenance agent who felt overlooked. She used insider knowledge to steal the Raphael painting and hired the Lazarovs to execute the betrayal.
Does Natalie survive after being thrown from the train? Yes. She is bruised but alive, and later reunites with the team in Montenegro, riding with a group of motorcyclists.
What happens to the Raphael painting Leda and the Swan? Helen recovers it from Marilyn’s backpack. Billie hands it over to Naomi for repatriation to its rightful owners.
How does the novel end for Billie and Taverner? Billie leaves with Taverner on a motorcycle, achieving closure on both the mission and their personal relationship. They ride off together, suggesting a renewed partnership.