In 1964 something happened at the Sanjeo Island Insane Asylum, something unspeakable. Now, thirty years later, it is about to happen again.

On Providenciales in the Turks and Caicos archipelago, four couples-a group of guys who have been friends since high school and their girlfriends-meet up for a vacation. During a fishing expedition into the deep Atlantic, the group discovers an island, remote and destitute, known as Sanjeo Isle. The charter's captain warns them off, describing the isle as nothing but death, but the guys see it as something more: an adventure, a challenge. Despite the captain's protests, they convince him to pull close enough so that they can swim to the island and back but once on the island, they become stranded.

Based on Chris Hays' best-selling Charter Comics' series The Forgotten Isle, Lyn I. Kelly expands the myth and mythos of the series into a novelization, bringing an origin to the horror of Sanjeo Isle and a future that does not stop with the last victim. A long time ago, an evil nested on Sanjeo Isle, an evil that destroys the strong and manipulates the weak. Now, that evil is hunting new prey.