Twenty people from all walks of life, all strangers to each other, wake up in an isolated island resort with no memory of how they arrived.  Each of them has a document, signed in their own handwriting:

1. I am player in the Game.
2. The players must participate
   in the Game.
3. The players may agree to
   change the rules.
4. The players must obey the
   rules or forfeit.
5. The winner of the Game is
   the last player who has
   not forfeited.

They have no explanation, and no communication with the outside world.  And, shortly after one of their number refuses to acknowledge the “game,” they all discover what it means to forfeit…

As more people die, and strange lights are seen inland, the survivors must struggle with the game and each other to discover why they’ve been placed here, and who is executing the losers.