In this third series, Dermot will guide viewers through crimes which shook local communities throughout Britain to their core: Nottingham's ‘Sneinton Strangler', Mark Martin, who killed three women between 2004 and 2005; the horrific murder of Hazel Dix by her previously convicted husband Glyn Dix; the murders by infamous Barking serial killer, Stephen Port, who raped and killed at least four men between 2014 and 2015; the  tragic fates of James Attfield & Nahid Almanea,  cut down indiscriminately by Britain's youngest ‘want-to-be' serial killer, James Fairweather; and the tragic death of Sana Muhammad,  murdered by her abusive ex-husband Ramanodge Unmathallegadoo,  using a crossbow in November 2018.

The five-part series will air across one week on Crime+Investigation® with each weeknight highlighting one of these cases which gripped the nation in fear until the killer was brought to justice.