Mystery

The prime suspects in the murder of David Walker seem to have watertight alibis despite the possibility of motives, but Cassie eventually has a breakthrough and an investigation of childhoods leads to an answer. Recap the finale of this season of Unforgotten.

Cassie and Sunny begin to uncover traumas and transgressions in the pasts of nearly everyone connected with their cold case, including the victim. David Walker had a dark life, and a new revelation against him soon transforms the entire investigation.

Another cold case sheds light on the murder of Jimmy Sullivan as everyone involved in the last days of his life begins to deal with the ramifications of their secrets and past. Cassie and Sunny struggle to decide who to trust as they finally solve the case.

As Cassie and Sunny continue interviewing people connected to their 39-year-old cold case, they discover that everyone is rewriting their past to conceal crimes or indiscretions: an affair, an assault, a robbery, bribes, torture. But who killed Jimmy?

When a skeleton shows up in the cellar of an old building, detectives Cassie Stuart and Sunny Khan are determined to find out who it is and who murdered them, no matter how old the case is. Their persistence is about to upend some lives that have been settled for decades.