Neither Man Nor Beast

From the Back of the Book: Shipwrecked on a desert island! Marooned among savage creatures who seem half human, half animal. Who can you trust? Kindly old Doctor Fran and his beautiful companion? The strange monks said to guard an evil artifact in their mountain fastness? Or the beast-man chief who gathers his people and prepares for war? Time is short, for you must escape the domain of Diosamblet, the Master of Pain, before the island works its curse on you and your companions in turn, leaving you... Neither Man Nor Beast. For four to six characters of levels 1-4