A true-crime drama. Four young gay men are murdered in similar circumstances between 2014 and 2015 in the Barking area of London.

Stephen Merchant plays killer Stephen Port, a real-life murderer and serial rapist who was sentenced to life in prison in 2016. Based on extensive research, interviews and published accounts of the harrowing crimes, this gripping drama looks at the devastating impact Port's crimes had on the victims' loved ones.