Captive

A girl wakes up in the middle of a forest. The only personal memories she has are of two people: her best friend and her mother. The only thing she has is a tattoo on her right arm. A boy finds her, and he shows her to a whole encampment of teenagers living on the island they are stuck on. And every one of them has a tattoo. Every tattoo is different. And every night, the Beast appear. It's best to stay on the shore, and whatever you do, stay in your hut. Keep your fire alight. The night is awake. And these teenagers are held captive.