My name is Frankie Elkin, and finding missing people is what I do. From #1 New York Times bestselling author Lisa Gardner comes a harrowing, "unputdownable" thriller set on a remote island where Frankie Elkin must locate the long-lost sister of a serial killer (Tess Gerritsen).

The case was sensational. Kaylee Pierson had confessed from the very beginning to the murder of eighteen men and waived all appeals. Now, with only twenty-one days left before her execution, she has finally received a lead on the whereabouts of the sister who was kidnapped over a decade ago, and she needs Frankie' Elkins's help to find her.

Frankie is an expert at finding missing persons that the rest of the world has forgotten, but even she couldn't have anticipated Pierson's request or question: When was the last time your search ended with finding the living? Unable to resist the chance for a rescue, Frankie takes on the mission.

Twelve years ago, five-year-old Leilani went missing in Hawaii. The main suspect? Pierson's tech mogul ex-boyfriend, Sanders MacManus. Now, on a remote island in the middle of the Pacific--the site of MacManus's latest vanity project--fresh evidence has appeared. In order to learn the truth and possibly save a young woman's life, Frankie must go undercover at the isolated base camp. Her challenge: A dozen strangers. Countless dangerous secrets. Zero means of calling for help. And then the storm rolls in...