Eva, a successful travel writer and former publisher, grapples with guilt and grief over her son, Kevin's, horrifying actions. Struggling to find a sense of normalcy in the aftermath, Eva contends with her troubled past and the breakdown of her family. Through a series of flashbacks, the film exposes the fraught history of Eva's relationship with Kevin, raising questions about nature versus nurture. Her memories reveal a child who resists typical maternal bonds and exhibits increasingly disturbing behavior. The tension within the family escalates as Eva's husband, Franklin, remains dismissively optimistic about Kevin's actions, creating a rift between the parents.

As Eva attempts to reconcile the affection she once had for her son with the revulsion she now feels, she faces a hostile community that holds her partially responsible for her son's deeds. The narrative peels back the layers of their family life, highlighting pivotal moments and choices that shape their shared history. It explores the complex dynamics of a mother struggling to connect with her son and confronts the harrowing implications of his nature. The emotional and psychological struggle between Eva and Kevin reaches a critical point, leading to a climax that forever changes the course of their lives.