The Police were alerted to him by a victim but they failed to keep Worboys in custody and his confidence grew. With exclusive access to his diary, we reveal the mind of a serial rapist. In another first, we hear John Worboys' police interview tape from 2007, which details the crucial moment the Metropolitan Police let Worboys go and their failure to interrogate him properly. Later, two of his victims became instrumental in securing Worboys imprisonment. One of the women has never spoken before, not even her family or her husband know of her connections to the case; we hear her powerful testimony in this film for the first and only time.