Ruth Ware skillfully interweaves the present with flashbacks to the past, illuminating the complex dynamics between the friends and the events that led to the tragic accident. The past catches up with the characters, showing how youthful decisions can shape adult lives.

The novel confronts the protagonists and readers with themes of guilt and atonement. Each friend carries their own burden of secrets and guilt, which resurface when the body is found. The question of responsibility for one's actions and the possibility of forgiveness runs throughout the story.

The book explores the ups and downs of friendship, showing how strong loyalty and love can be, but also how quickly jealousy, mistrust, and secrets can test these bonds.