The Beast of Manchester's secret box holds the key to solving a decades-old mystery. In this chilling true crime documentary, we uncover shocking new evidence from the prison cell of Trevor Hardy, a serial killer whose 1970s murders of three teenage girls shocked the nation. Exclusive interviews and unearthed documents reveal the twisted mind of this forgotten killer and missed opportunities to bring him to justice. Prepare to be disturbed. Subscribe for more true crime: youtube.com/c/RealCrime Check out our new crime podcast, COLD TAPES, where YOU are the lead detective! https://coldtapes.com/?utm_source=Real%20Crime&utm_medium=YouTube%20video&utm_campaign=