The Case of the Murdered Mum

Is a man driven to kill the woman he loves? Or is she another fatality in an underworld hit? Also an innocent mum answers a mysterious knock on the door and is struck in the head in a barbaric attack. Is her husband to blame? And an elderly man is brutally bashed to death in his home. With no clues in sight could a pacemaker prove to be the key in catching his killer.