A Rich and Dangerous Game by Lionel White
Paperback. Condition: Very Good. 1978. Dell.
Jill Holmes is the lovely widow of one of America's most celebrated men, now married to Cosmos Papalias, the notorious Greek industrialist.
Jill and Papalias are forwarned that the Greek government is planning to confiscate his assets. To prevent the loss of his fortune, Papalias loads his yacht with gold, jewels, and banking certificates and sets sail for a safe port along with a cast of "beautiful people".
It was a foolproof, ingenious plan, that started off right on schedule. It would have worked if a likable; larcenous American didn't have an even better plan -to hijack the entire ship and all the guests for the millions of dollars on board.