After discovering a body after a devastating flood, PC Jo Marshall begins investigating the man's possible murder - however, pursuing the killer will change everything for her.

Jo's actions bring an unwelcome visitor to Waterside, who threatens to expose her secret investigation.

Jo is troubled by Lee's connection to Tasha and Daniel, and Pat grows suspicious as she continues with her investigation.

As the investigation escalates and suspicion builds around Tasha, Jo finally makes a breakthrough and Molly finds herself in danger.

With Pat now a part of her investigation, Jo and Tasha discover an unexpected side to Daniel's life and Jo closes in on the killer.