The Mind Game by Hector MacDonald
Mandanzi, Africa. Paradise on earth. Ben knows that nothing this good comes free. But he's prepared to pay the price. What seems on the surface to be a passionate holiday with his lover is, in fact, the first crucial stage of some ground-breaking research. Ben and his renowned Oxford professor are on the brink of developing a cure for that most disturbing illness - sickness of the mind. Lying on the beach with the bewitching Cara, Ben finds it easy to forget the real purpose of his trip to Africa. Until paradise turns to hell, and suddenly he realises that all the rules he thought he was playing by no longer apply.