When five random people, who have never laid eyes on the other, receive an invitation to a party from an unknown sender who claims to have met them at a certain point in time, things start to get weird. In each letter these people are offered something they desperately need, but only if they attend. One by one they turn up to the location to find an old prison in the middle of nowhere. Assuming this is all part of the theme, they enter. But what they find is anything but a party. And sometimes... Well sometimes things just don't go as planned.