Dublin's notorious Canal Killer is ten years into his life sentence when a body is fished out of the Grand Canal. Detectives suspect a copy-cat is emulating the crimes and they must turn to Ireland's most prolific serial killer for help. Will admits he has the information the cops need, but will only give it to one person... When Alison Smith gets the request from Dublin, she is pulled back to face the man she's worked so hard to forget.