Ray Robertson mysteries

"RCMP Sergeant Ray Robertson is serving with the United Nations in Haiti when an American businessman comes home to find his young Haitian wife floating face down in the swimming pool. At the insistence of the American embassy, the Haitian police immediately arrest the gardener, and the case is closed. But Ray isn't so sure. One night he finds himself in a Vodou-saturated cemetery, surrounded by above-ground tombs and confronting a killer with nothing...