Parenting expert Jo Frost explores the psychology of child murderers, starting with Daniel Bartlam, who at age 14 kills his mother with a hammer and sets fire to her body in their family home.

James Fairweather, a 15-year-old obsessed with serial killers, stabs two strangers to death in Colchester, England, in 2014.

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

Jo Frost looks at what motivated a 14-year-old boy to murder his schoolmate after luring him to his house with a faked letter from a teacher.