Over the Easter weekend in 2015, a gang of criminals robbed a safe depository in London's Hatton Garden, the centre of the UK's diamond trade. Shortly before, electrical cables under nearby Kingsway had caught on fire, disrupting the emergency services in the area. Coincidence? Alarms at Hatton Garden Safe Deposit Ltd went off, but the police ignored them. The burglars were caught on CCTV taking jewellery worth up to $200 million. Within a month nine suspects had been arrested and valuables seized from their homes. They were aged between 43 and 76, including a father and son. In this investigation of the case and its aftermath, Gordon Bowers digs deep into the history of heists around the world and questions the motives and methods behind diamond theft.