A busload of high school students crashes in the bush in a remote part of Aotearoa, New Zealand. Only a few of the teenagers survive; they find their phones don't work, there's no food, and they've only got their wits to keep them alive. There's also something strange happening here. Why are the teenagers having nosebleeds and behaving erratically, and why is the rescue effort slow to arrive? To make it out, they have to discover what's really going on and who or what is behind it all.