It is 3 years since Peter Diamond's wife was killed and he is being stalked by a woman who wants to become better acquainted. ACC Georgina Dalley's friend's daughter has gone missing . A woman's body is discovered hanging from a public playground swing, at first sight a suicide, but then it seems she may already have been dead when hung there. The discovery of a second body seems to signal that they have a "hangman" on the loose. Very very readable.