The documentary looks at the crimes of Donna Perry, a transgender serial killer who blamed her murders on Douglas Perry, the man she used to be.

A profile of Shawn Grate, who was given the death penalty in June 2018 after being convicted of two murders in Ashland County, Ohio.

The crimes of Mark Martin, who idolised serial killers before becoming one himself. Martin killed three homeless women in Nottingham between December 2004 and January 2005.

A profile of murderer James Fairweather, who stabbed two people to death in Essex in the space of three months in 2014.

Delving into the crimes of William Devin Howell, who murdered opioid-addicted prostitutes in Connecticut and managed to keep the killings secret for 14 years.

This episode looks at Stephen Port, who preyed on young men and spent hours searching web porn. The predator took the lives of four much-loved men.

This episode deals with Jesse Matthew, guilty of the murders of Morgan Harrington and Hannah Graham.