SURVIVAL INSTINCT (4) by Rachelle McCalla: Threats from an ex-fiance result in Abby Caldwell being stranded on an island with a storm brewing. She's glad to have the company of Scott Frasier, a man she knew in college. As Scott and Abby struggle to find a way off the island for themselves and Scott's mother and stepfather, they suspect their situation is the result of a thief who wants his mother's diamonds. Once their rescue is accomplished, they discover Scott's mother is missing and that there's a lot more going on with their current troubles. McCalla's exciting mystery has a number of twists that all come together in a well-crafted conclusion.