In 1954 on a remote island in Massachusetts Bay, a mental patient has escaped from Ashecliffe Hospital. Since there is no way off the island, logic dictates that she must be hiding somewhere, and the hospital calls in US Marshalls Teddy Daniels and Chuck Aule to flush her out. But when they arrive, they find that there is more going on than a simple escape, and a lot of it is in their own heads--and an approaching storm isnt going to make things easier....