Towards zero

An elderly widow is murdered at a clifftop seaside house...What is the connection between a failed suicide attempt, a wrongful accusation of theft against a schoolgirl, and the romantic life of a famous tennis player? To the casual observer, apparently nothing. But when a houseparty gathers at Gull's Point, the seaside home of an elderly widow, earlier events come to a dramatic head. It's all part of a carefully paid plan - for murder...