Unforgotten (2015)

S3E2 Episode 2

Cassie and Sunny embark on a quest to locate Hayley's family as media coverage intensifies. A detective from the initial investigation shares insights into why the case has gone cold, highlighting that Hayley's boyfriend was a person of interest but never officially accused. The significant gap between Hayley's last known location and where her body was discovered prompts Cassie to develop a fresh hypothesis—that the murderer may have come from London and left before law enforcement could interview them.