Blackmail lures Ava to the abandoned amusement park on Portgrave Pier. She is one of ten teenagers, all with secrets they intend to protect whatever the cost. When fog and magic swallow the pier, the group find themselves cut off from the real world. As the teenagers turn on each other, Ava will have to face up to the secret that brought her to the pier and decide how far she's willing to go to survive. The teenagers have only their secrets to protect and each other to betray.