A chilling look at the crimes of Stephen Port, the east London serial killer who poisoned four young men with lethal doses of a date rape drug.

A closer look at the crimes of Steve Wright, who was dubbed 'The Suffolk Strangler' after murdering five women who worked as prostitutes in Ipswich in 2006.

An inside look at the series of mysterious deaths that occurred at the Stepping Hill Hospital in Stockport, Greater Manchester, in 2011.

The harrowing story of EastEnders actress Gemma McCluskie, who was murdered by her older brother in the flat they shared in east London in 2012.

The tragic story of Ann Maguire, who was stabbed to death by a teenage pupil while teaching a Spanish lesson at Corpus Christi Catholic College in Leeds.

The series returns to take a closer look at the most horrific crimes ever committed on British soil, starting with the May 2017 Manchester Arena bombing.