Heather Baxter marries Tom, a widowed doctor with a young son and teenage daughter. A vacation overseas seems like the perfect way to bring the new family together. When they discover a remote island, off-limits to outside visitors, the family talks their way onto the ferry, taking a chance on an adventure. Then a shocking accident propels the Baxters from an unsettling situation into an absolute nightmare. The unmissable new thriller from the bestselling author of "The Chain".