The last thing seventeen-year-old April Parker expects is to end up locked inside a facility with dozens of other teenagers. There are no signs of their kidnappers and no one to tell them what's going on. At first, the kids form friendships and create alliances to survive. But challenges arise when some of the stronger teens fight for control and power. And the weaker ones-like April and her new friends-struggle to survive and make sense of the things happening around them. As conditions become even more stressful and the teens' endurance is put to the test, stranger things start to happen. Supernatural things. Dangerous things. And no one is coming to save them.