Jo asks what drives a son to kill his mother, examining the 2011 case of 14-year-old Daniel Bartlam, who bludgeoned his mother to death and proceeded to set her body on fire.

Jo examines the case of a child obsessed with serial killers, who stabbed two strangers to death in Colchester in 2014.

Jo Frost looks at 12-year-old killer Sharon Carr who brutally stabbed Katie Rackliff in 1992. After the murder in Farnborough, Hampshire, it took police four years to uncover the truth about the killer's identity.

A look at the brutal murder of an 11-year-old boy with Cystic Fibrosis back in 2006, where the murderer is his 14-year-old classmate named Michael Hamer. Michael stabbed the boy after luring him to his house with a faked letter from a teacher.