Somebody is killing innocent people all over Wales leaving headless chess pieces as a calling card. The four Welsh Forces are at their wits' end and they have no clues. The killings seem to be without motive. A new dedicated unit, The Serious Crime Squad, is formed to work from a new base which is situated in a Cardiff terraced house. The team consists of two Detective Inspectors. Mike Karetzi is young, unorthodox and a maverick, whereas Evan Jones is pedantic, works by the book and is nearing retiring age. The third member is a big, black sixty-year-old woman who is an expert in computers...