The Perfect Couple Ending Explained: Who Really Caused Merritt’s Death?

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

What Happens at the End? A Literal Account

Merritt Monaco, the maid of honor, drowns during the rehearsal-dinner weekend of Benji Winbury and Celeste Otis. The police investigation initially treats it as a suspicious death. The final chapters reveal the truth: Merritt's death was a tragic accident caused by a sleeping pill slipped into a drink meant for someone else.

In Chapter 37, Greer Garrison Winbury pieces together what happened. Her daughter-in-law Abby, Thomas Winbury's wife, discovered Greer's potent sleeping pills on the counter. Abby intended to drug Featherleigh Dale—the woman she believed was having an affair with Thomas—to prevent her from sleeping with him. But the drugged drink was handed to Merritt instead. Merritt, already distraught after Tag ended their affair and learning she was pregnant, went into the water to retrieve Tag's silver ring she had thrown away. The combination of the sedative and the cold water led to her drowning.

The police rule the death accidental, lacking evidence to charge anyone. Greer decides to keep the truth secret forever to protect the Winbury family's reputation.

The Climax: How Merritt Monaco Died

The key revelation comes in Chapter 37 when Greer finds her missing pillbox in Thomas's trash. She overhears Thomas and Abby arguing and deduces Abby's motive. Greer's internal reasoning is confirmed: "Abby dropped a pill in Featherleigh's drink, only the drink had gone to the wrong person. It had somehow gone to Merritt." The novel never shows the exact moment the drink was switched, leaving a small ambiguity. However, the narrative strongly supports that Merritt was the unintended victim.

Earlier, in Chapter 38, we see Merritt's final moments from her perspective. She and Tag take a kayak ride where Tag cruelly insists their affair was only a fling. Merritt jumps into the water to get his attention, nearly drowns, and Tag rescues her. Back on shore, she cuts her foot on glass, reveals her pregnancy, and decides to raise the child alone. She throws away Tag's ring, then wades back into the water to retrieve it. The ring remains out of reach, and the chapter ends with her in the water—suggesting the pill had already taken effect.

Major Character Outcomes

Greer Garrison Winbury

Greer becomes the keeper of the secret. She chooses family loyalty over justice, resolving that the truth will die with her. The book ends with her steely determination: "The future of the Winbury family depends on it." She remains a morally complex figure—a protective mother willing to suppress a potential crime.

Tag Winbury

Tag is exposed as Merritt's lover and the father of her unborn child. He is not physically responsible for her death, but his emotional cruelty during the kayak ride contributed to her reckless state. Benji accuses him of murder, but Tag is never charged. His marriage to Greer survives, held together by mutual deception.

Celeste Otis

Celeste ultimately breaks her engagement to Benji. In Chapter 36, she tells Benji she will not marry him "ever," explaining her decision is about herself. She had been torn between her love for Shooter and her sense of duty. After Merritt's death, Celeste chooses authenticity. In Chapter 34, she rejects Shooter's last-ditch proposal at the airport, realizing she needs time alone. Her final decision remains open-ended—she plans to travel by herself.

Shooter Uxley (Michael Oscar Uxley)

Shooter's romantic pursuit of Celeste is revealed to Benji, ending their friendship. He is arrested briefly but released. He receives an anonymous threatening photo of himself and Celeste outside Steamboat Pizza, implying someone (likely Greer) is ensuring his silence. Shooter leaves Nantucket, his future uncertain.

Chief Ed Kapenash

The Chief closes the case as an accidental drowning, despite his personal suspicion that foul play occurred. He is motivated partly by the lack of evidence and partly by pressure from the Nantucket Chamber of Commerce to protect the wedding industry. He remains haunted by the role his foster daughter Chloe played in dropping the tray of glasses that led to Merritt's cut foot—a small but consequential detail.

Karen Otis

Karen, terminally ill with cancer, learns the truth about Merritt's death through her own guilt. She had thought her painkillers might have been taken, but she counts them and finds them all there. In Chapter 32, she flushes three of her own "pearlescent ovoid" pills down the toilet, having suspected Merritt might have taken one. Karen's secret adds another layer of hidden truths. She and Bruce return home, and Karen experiences a fleeting remission of pain, allowing her to stay for her daughter a little longer.

Others (Thomas, Abby, Featherleigh)

Thomas Winbury is revealed to have had his own long-term affair with Featherleigh Dale. He never learns the true cause of Merritt's death.
Abby likely never realizes her intended drugging went to the wrong person. Greer keeps the secret from her.
Featherleigh Dale escapes Nantucket without being arrested, as the police never find her. She is last seen at Crosswinds bar waiting for a standby flight.

Resolved and Unresolved Threads

Resolved:

The cause of Merritt's death is identified: accidental drowning due to an undigested sleeping pill.
The question of who drugged the drink is resolved for the reader (Abby, intended for Featherleigh).
Celeste calls off the wedding and rejects both Benji and Shooter, choosing independence.
The police investigation officially closes with an accidental death ruling.

Unresolved:

No one is held legally accountable. Greer's cover-up ensures Abby never faces consequences.
The novel does not reveal whether Benji ever learns the full truth about his mother's protection of the family.
Celeste's future is left open. She leaves for a solo trip, but we don't know where she ends up.
Shooter's receipt of the threatening photo is never explained definitively—it implies Greer's involvement, but this is left ambiguous.
The ring Merritt tried to retrieve remains lost at the bottom of the harbor.

Theme Resolution

The novel's central themes reach a dark resolution:

Infidelity and Secrets: Every major character harbors a secret that contributes to the tragedy. The Winbury family's long history of infidelity—Tag's affair, Thomas's affair, Greer's knowledge—creates the toxic environment that leads to Merritt's death. The book suggests that secrets, when left unaddressed, have fatal consequences.
Class Divide: The Winburys' wealth allows them to control the narrative. Greer uses her social power to suppress the truth, while the Otises (middle-class) are left helpless. The justice system fails because of class privilege.
Family Loyalty and Deception: Greer's choice to protect the family name over seeking justice is the book's final statement. Loyalty becomes a form of complicity.
Grief and Terminal Illness: Karen's suppressed illness mirrors the hidden grief of all characters. Her decision to hide her cancer from Celeste parallels the wider culture of denial.
Justice vs. Reputation: The police chief chooses to rule the death accidental, prioritizing Nantucket's reputation over a full investigation. The novel critiques how image often trumps truth.

The Epilogue (Chapter 39)

Chapter 39, titled "Discover More Elin Hilderbrand," is not a narrative epilogue. It is a promotional section directing readers to other books by the author. No character interactions or plot developments occur. The story truly ends with Greer's decision in Chapter 37 and Merritt's final swim in Chapter 38.

Reasonable Interpretations

Could Merritt have knowingly taken the pill? The text shows that the pill was intended for Featherleigh, and Merritt was distraught but not suicidal. The accident interpretation is most consistent with the evidence, though some readers may see her wading into the water as reckless.
Did Greer suspect Abby earlier? Greer's deduction in Chapter 37 suggests she had no prior knowledge. Her decision to conceal the truth seems opportunistic, not premeditated.
Is Chief Kapenash complicit? He is an experienced detective who suspects foul play but allows the accident ruling. His motivation is partly professional—lack of evidence—and partly personal: protecting his foster daughter Chloe's involvement from scrutiny.
What happens to Celeste after the book ends? The novel leaves her on the precipice of self-discovery. She has chosen neither Benji nor Shooter, implying she will forge her own path. The reader is left to imagine her future.

Reader Questions and Answers

1. Who killed Merritt Monaco?

No one intentionally killed Merritt. Her death was an accident caused by a sleeping pill that was slipped into a drink. Abby Winbury intended to drug Featherleigh Dale, but the drink was mistakenly given to Merritt. The combination of the sedative and Merritt's decision to wade into the water to retrieve a ring led to her drowning.

2. Why did Greer cover up the truth?

Greer learns the truth in Chapter 37 and decides to keep it secret to protect the Winbury family name. She believes that exposing Abby's mistake would destroy Thomas's marriage, embarrass the family, and potentially lead to criminal charges. Greer prioritizes reputation over justice.

3. Did Celeste love Benji or Shooter?

Celeste was genuinely torn. She had strong romantic feelings for Shooter, but her sense of duty and her fear of hurting Benji led her to accept Benji's proposal. After Merritt's death, Celeste realizes she cannot marry Benji. She also rejects Shooter at the airport, indicating she needs to love herself first. Her final choice is to be alone.

4. What was Merritt's pregnancy about?

Merritt was seven weeks pregnant with Tag's child when she died. Tag had ended the affair weeks earlier, but Merritt planned to raise the baby alone, possibly as an influencer unwed mother. The pregnancy added urgency to Tag's desire to end the relationship and deepened Greer's motive to protect her husband.

5. Did Shooter know about Celeste's doubts?

Yes. Shooter slipped a note under Celeste's bedroom door during the rehearsal-dinner weekend saying, "In case you have any doubts, I'm in love with you." He knew she was conflicted. He also planned to run away with her the morning after the rehearsal dinner—a plan Celeste initially agreed to before discovering Merritt's body.

6. Is there a sequel or series?

No. The Perfect Couple is a standalone novel. The epilogue (Chapter 39) is a promotional section for other Elin Hilderbrand books, not a hint at a sequel. Characters do not reappear in later novels, though Nantucket itself features in many of her other works.