In Hawaii, FBI agent Karen Vail pursues a killer without a profile, in this thriller by the USA Today-bestselling author of The Darkness of Evil. When Det. Adam Russell of the Honolulu PD encounters the body of a woman in her sixties--the second in recent days to inexplicably die of what seem like natural causes--he reaches out to Karen Vail, the renowned FBI profiler, who hops on the next plane. But even for someone...