Trevor Hardy, known as the 'Beast of Manchester', committed a series of horrific murders in the 1970s, but the reasons why have remained unknown...until now. He escaped capture for nearly two years. However, for the first time ever, thanks to unique access to the box of his personal files found in his prison cell and left to his younger brother after his death, we reveal the dark truths about Trevor's brutal killing spree. We look at how the Greater Manchester Police missed a perfect chance to capture Trevor, which could've saved the lives of his last two victims, and how Hardy could've been responsible for a further murder of 17-year-old Dorothy Leyden - a case that remains cold until this very day.