Looking for peace and quiet, park ranger Anna Pigeon thinks she's found them in a temporary assignment at Dry Tortugas National Park, 70 miles off Key West. But trouble always finds her. Along with a boat explosion – and the discovery of unidentifiable body parts – a Civil War-era mystery threatens Anna's sanity and her life. 11th in the series. "Engaging... Few writers spin a more exhilarating web."—Booklist