With privileged access to the investigating team and behind the scenes police footage, Susanna Reid explores a cold case inquiry into one of Britain’s most prolific serial killers, revealing the extraordinary game of cat and mouse that Pembrokeshire detectives waged against a man they suspected had brutally murdered at least four people.
As investigators hunted for proof, they made an extraordinary discovery their suspect, John Cooper, had appeared on the gameshow Bullseye just weeks before the vicious shooting of a couple on a holiday in Wales. With the crime scene long gone, and no witnesses to help the enquiry, everything hinged on the police interview. Could the detectives find the key to make him reveal the truth about these murders?
