Serial damage - Liz Cowley

An 80-year-old widow is pruning her roses in Cornwall when she is shot dead by a stranger. This is the first of a series of apparently unconnected murders in equally disconnected locations all over the world-England, Ireland, Hong Kong, the U.S., and France. All are the result of one man's obsessive mind. Because of the geographical spread of his carefully planned, mysterious, and apparently "motiveless" murders, they would normally be impossible to solve by the many different police forces-but a psychologist who works for Scotland Yard could have a personal tie to him.