It should be a lot of fun, meeting up for a long weekend in a rented lighthouse on a chunk of rock miles from anywhere. There will be drinks and games and all sorts of other amusements. It is ten years since the last get-together and twenty years since Nadia and her friends graduated from university. But not everything goes according to plan. One of the group has a more sinister agenda and, as events begin to spiral out of control, it becomes clear that not everyone will get off the island alive.