Jess struggles with serious mental health issues after her third pregnancy, including maternal OCD characterized by obsessive thoughts about harming her children, compulsive rituals like aligning rings and cleaning obsessively, and a deep fear of losing control. This mental state contributes to her feelings of unworthiness as a mother and complicates the investigation into her daughter's injury.

Initially, suspicion falls on Jess due to her odd behavior and inability to explain how Betsy was injured. However, as the investigation progresses, suspicion shifts to Ed, Jess's partner, and even to their older children. The story explores how blame is assigned and magnified, especially towards mothers, as social services and police dig deeper.