From 2008, the remains of more than 90 individuals have been recovered from the canals, rivers, lakes and ponds of Greater Manchester - most of them young men. News of the discoveries has sparked theories that a serial killer may be operating in the area, and the story has now caught fire on social media. In this unflinching First Cut documentary, made by first-time director Darren Lovell, former murder detective Tony Blockley reviews the cases of three young men who drowned in the city's canals. Two of them went missing only to turn up dead later, while the third was seen leaving a nightclub with a mystery man who has never been identified. Is the so-called 'Pusher' real or a 21st-century urban legend? (BriteSpark Films)