The Joker in the Pack — James Hadley Chase

When Helga Rolfe flies into Nassau to join her elderly millionaire husband, Herman, she finds plenty of bad news awaiting her. Crippled, suspicious Herman has long suspected she's been playing around since their marriage, and is proposing to write some nasty-looking terms into his will. Herman is right, of course - Helga's weakness is for handsome, sexy men like Harry Jackson, whom she meets on the beach the day she arrives. But Harry is not quite what she thinks - and because of him she suddenly finds herself in a nightmare world of blackmail, voodoo and violence ... 'I always enjoy his books ... he just keeps me reading' George Macdonald Fraser