In this groundbreaking and revelatory new documentary format, Piers Morgan ventures behind bars for an extraordinary encounter with diagnosed psychopath Paris Bennett, a man who is more intelligent, more cunning and more manipulative than any criminal Piers has met before. In Bennett's first interview on British television he talks to Piers about stabbing his four-year-old sister Ella to death in a cold deliberate act of murder and admits that the crime was driven by a calculated desire to inflict pain and misery upon his mother, Charity - who is watching the encounter as it unfolds on a TV monitor in a nearby room. With a story that will leave any parent genuinely torn over what they would do in Charity's situation - and expert analysis that adds a fascinating layer to the prison encounter - Piers' interview with Paris lays bare the workings of a dangerous mind, and the terrible toll a violent psychopath can inflict on those who love them the most.