A young mother is feared dead. Seven years later, her ex-partner dials 999 admitting he's responsible. After he retracts his confession, an undercover cop gets to the truth. Plus, the heartbreaking death of a 10-month-old baby and his parents' 999 lies.

Together 30 years, David and Ann-Marie Pomphret seemed a close and loving couple. When Ann-Marie is found battered to death, a distraught David dials 999. Forensic scientists detect microscopic blood cells on his unwashed socks and the truth is revealed.