The investigation into Christopher Halliwell by Detective Steve Fulcher has been one of the biggest crime stories in recent years, captivating the public's attention. Spanning more than a decade, multiple murders, two highly-publicized trials, and one irreparably damaged career, it is a story of the dogged pursuit of a serial killer by a police officer determined to get justice. From the moment the case of a missing 21-year-old girl named Sian O'Callaghan landed on the desk of DCI Fulcher, the hunt was on. Over the following five days came a game of cat-and-mouse of the utmost stakes, characterized by the relentless pursuit of a killer by a seasoned detective with decades on the force. Some flashing lights sequences or patterns may affect photosensitive viewers.