tselling author Lisa Gardner, a "frightening, full of twists, and completely satisfying" thriller in which Frankie Elkin must locate the long-lost sister of a serial killer (Karin Slaughter).

Five-year-old Leilani Pierson has been missing for over a decade. Amateur detective Frankie Elkin is an expert at finding missing persons. But this case has unusually high stakes. The request comes from Leilani's sister Kaylee, a convicted serial killer weeks away from her execution date.

The main suspect in the kidnapping? Kaylee's ex-boyfriend, a tech billionaire who has hidden himself away on a remote base camp near Hawaii.

Determined to find the missing girl-alive-Frankie embarks on a dangerous mission. Up against a ticking clock and an incoming tropical storm, will Frankie Elkin learn the truth and save Leilani before it's too late?