From #1 New York Times bestselling author Lisa Gardner comes a harrowing new installment in the Frankie Elkin series. Frankie Elkin is an expert at finding the missing persons that the rest of the world has forgotten. However, she couldn't have anticipated the latest request—to locate the long-lost sister of a female serial killer facing execution in three weeks' time.

No man truly fears a woman. Not even one who is her father's daughter.

The case was sensational. Kaylee Pierson had confessed from the beginning, waived all appeals. She had called herself 'death,' but people called her the devil. Despite the media's chronicling of her tragic circumstances—the childhood spent with a violent father—no one could find sympathy for 'the Beautiful Butcher' who had led eighteen men home from bars before viciously slitting their throats.

Now, with only twenty-one days left to live, Pierson has received a lead on the whereabouts of the sister who was kidnapped over a decade ago. She needs Frankie's help to find her. The Beautiful Butcher's offer: When was the last time your search ended with finding the living?

Unable to resist the chance for a rescue, Frankie takes on Pierson's request. 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. To learn the truth and possibly save a young woman's life, Frankie must go undercover at the isolated base camp. A dozen strangers. Countless dangerous secrets. Zero means of calling for help. And then the storm rolls in…