February 13th. What seemed like Wilma Fenton’s lucky night, when she scooped her biggest-ever win at bingo, turned out to be the night she died. The only eyewitness to her murder is Tony Baker, a well-known journalist and TV personality who, years ago, single-handedly tracked down a serial killer who had eluded the police. The man the media call the “Anonymous Assassin” publicly announces he will kill again, and challenges Baker to catch him before he does. In the full glare of the national media, Bartonshire police mount a huge hunt for the killer, with Detective Chief Inspectors Lloyd and Hill spearheading the investigation.