After answering a call about a neighborhood prowler, Detective Mare Sheehan shoulders her chief’s directive to revive an unsolved missing person’s case amid increased community pressure.

Mare visits a grisly murder scene before informing the victim’s enraged father. As a video from the night of the crime surfaces, Mare questions suspects in the case.

As Mare and Colin parse new physical evidence, phone records lead to an unlikely suspect. Mare receives some unprompted advice from Richard on how to move forward with Carrie.

With Mare forced to take a backseat on the case, Colin presses a local priest about the vague circumstances that prompted his transfer to the parish.

In her mandated therapy, Mare opens up about her family’s history with mental health struggles. Meanwhile, Lori tries to get to the bottom of her son’s outburst at school.

After a heroic rescue lands her in the hospital, Mare awakes to the unshakeable pain of losing a friend. Then, given a second chance by Chief Carter, Mare reevaluates old suspects.

When her investigation takes a series of devastating turns, Mare's friends and family members process the fallout as she attempts to finally find her own way forward.