Former met police detective chief inspector colin sutton spent 30 years in the police force, a career that saw him lead many of the most high profile and successful murder investigations of his generation. In this feature length programme, colin and his team take you through the investigation into one of the uk’s worst rapists with a reign of terror that spanned almost 20 years. Nicknamed ‘the night stalker’, delroy grant would sneak into the homes of the elderly and assault them before disappearing into the night. He went undetected for 17 years but was finally arrested in 2009, only 7 months after colin sutton was brought on board and 17 days after his new plan had been launched.