Olivia Manning 
Rain Forest 

From one of the classic writers of post-war English literature comes a stunning novel of love, betrayal and redemption. Married but obstinately set in their separate ways, Hugh and Kristy Foster know nothing of Al-Bustan, a far-flung island in the Indian Ocean. Too late they discover how it seethes with unrest and intrigue. Yet now when they need each other, the sullen, muttering forest seems only to intensify their differences.