Wetherton CID struggles to track down a serial killer with a penchant for words, as Messrs Dalziel and Pascoe take on their most puzzling and challenging case to date. The sublimely confident killer leaves a dialogue for the police to find after each murder. These chilling documents, carefully written and lovingly illustrated, describe each killing in detail and, at the same time, are strewn with tantalising hints and clues.