Chapter Fifty-Five Summary and Analysis

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

Summary

The chapter opens with Isabelle recalling the moment she discovered she was pregnant with Mason. She sat on a bathroom floor, staring at a faint positive test, and felt a fleeting second of regret. She had hoped a baby might save her failing marriage to Ben, but in that moment she feared it would only trap her further.

In the present, Isabelle sits with Waylon, who has just told her that Allison was pregnant when she died. Waylon insists his sister would never have overdosed while carrying a child. Isabelle remembers Allison’s behavior at the rooftop party: carrying a champagne flute but smelling of mouthwash, touching her stomach, and hinting at the pregnancy. Isabelle tries to suggest that Allison might have been struggling mentally, but Waylon refuses to accept suicide as a possibility.

Waylon then confesses that he has been investigating Ben, not Isabelle. He reveals that at Allison’s memorial, he saw Isabelle and Ben kissing outside the house. That sight convinced him that Ben killed Allison. When Mason went missing, Waylon knew Ben was responsible again. He admits he researched Isabelle’s past to decide if he could trust her, which is why he found the article about her mother.

Isabelle resists the idea that Ben could hurt his own son, but Waylon argues that Ben never wanted to be a father and would rather avoid the burden of single parenthood. Isabelle reflects on Ben’s controlling nature—he would never leave things to chance. She realizes that Ben could have taken Mason without leaving any evidence: he knew the baby monitor battery was dead, could open the window silently, and could walk out the front door. The possibility that Ben came home and pretended to have been there all along fills Isabelle with sickness and despair.

Key Events

Isabelle’s flashback to discovering her pregnancy and her regret.
Waylon reveals that Allison was pregnant and would not have overdosed.
Isabelle recalls Allison’s behavior at the rooftop party, confirming she knew.
Waylon admits he saw Isabelle and Ben kissing at Allison’s memorial.
Waylon explains his investigation into Ben and why he looked into Isabelle’s past.
Isabelle wrestles with the idea that Ben killed Allison and took Mason.
Isabelle realizes Ben could have staged Mason’s disappearance without leaving evidence.

Character Development

Isabelle: Confronts her own past regret about pregnancy and her desperate hope to save her marriage. She begins to accept that Ben may be capable of murder.
Waylon: Reveals his true motive: he has been hunting Ben for years, believing he killed Allison. He is not an enemy but an ally trying to bring Ben to justice.
Ben: Implied to be a manipulative, controlling figure who never wanted fatherhood and may have eliminated both wives and his son to regain freedom.

Themes, Symbols, or Motifs

Entrapment: Both Isabelle and Allison felt trapped in their marriages and pregnancies. Isabelle’s flashback mirrors Allison’s likely feelings.
Pregnancy as a trap: The positive pregnancy test becomes a symbol of being locked into a life with the wrong person.
Deception and hidden motives: Waylon’s investigation and Ben’s secret actions reveal how much has been hidden beneath the surface.
The unreliability of memory: Isabelle reinterprets her past with Ben in a new, darker light.

Why This Chapter Matters

This chapter is a turning point that shifts the entire investigation. Waylon’s revelation that Allison was pregnant eliminates suicide as a plausible explanation for her death and points directly at Ben. Isabelle’s realization that Ben could have taken Mason without leaving evidence ties the two cases together and suggests that the true threat has been in her house all along. The emotional weight of Isabelle’s flashback deepens her understanding of both her own past and Allison’s, making Ben’s guilt feel inevitable.

Study Questions and Answers

What does Waylon reveal about Allison’s pregnancy, and why does he believe it proves murder?
Waylon reveals that Allison told him and his wife she was pregnant early on. He believes she would never have taken her own life while carrying a child, so her overdose must have been staged by Ben.
How does Isabelle’s flashback to her own pregnancy parallel Allison’s situation?
Isabelle recalls feeling trapped and regretful when she saw the positive test, wondering if a baby would make her marriage worse. This parallels the idea that Allison may have felt similarly trapped, but unlike Isabelle, she never got a chance to change her mind.
What evidence leads Isabelle to believe Ben could have taken Mason?
She realizes Ben knew the baby monitor battery was dead, could enter the nursery without waking Roscoe or Mason, could open the window to stage an intrusion, and could leave through the front door with no prints. His calm return to bed afterward would have been easy.