A tropical paradise... Jemma and Alex are paranormal investigators, writing a book on hauntings around the world. When Jemma begins researching a cryptic diary written by a young woman who committed suicide on a supposedly haunted island in the Philippines years earlier, they think they've found their next chapter. A tragic past... It doesn't take long for the pair to learn that the island harbors long-buried secrets, while savagely mutilated bodies turn its cerulean seas bloodred around them. An ancient legend... For the spirits here are demanding, and Jemma must confront her own demons while attempting to save herself and Alex from taking a permanent vacation to Sacrifice Island.