Grave Secret by Charlaine Harris

Harper Connelly has spent years using her unusual talent to find the dead bodies of the missing. Deciding that a break is needed, she takes a trip to Texas to visit her two younger half-sisters, only to find that the one *** she could never solve, the *** of her sister, has come back to haunt her. With the help of her step-brother Tolliver and some newly surfaced information, this just may be her chance to put this final mystery to bed.