Dangerous Games — Lesley Grant-Adamson

A liar and a charmer, Jim Rush is a young American with a weakness for trouble. On the run from the British police - he's wanted for a murder he didn't commit - Jim finds a hideaway in St. Elena, a small Caribbean island where his English girlfriend Jane has secured him an invitation. Quickly tiring of the snobbery and childishness of Jane's uppercrust friends, Jim feels trapped, and can't resist playing a game of his own, when he encounters a couple of small time hustlers who claim to have found sunken treasure. When Jim attempts to turn the tables on these con men, the result is murder.