Harold Shipman was a predatory murderer who preyed on the vulnerable and old, killing an estimated 250 people over a 30-year period. By the 1990s, he had even killed patients in his own GP's surgery. This documentary features moving interviews from the daughter and son-in-law of Kathleen Grundy, one of Shipman's 3,000 patients. Grundy became one of Shipman's victims and was also the key to his undoing.