"What if there were a game you didn't know you were playing? Where you didn't know the aim and you hadn't seen the rules?" Charlotte Pollard arrives in a toyshop, but she doesn't know where she is—or even who she is. The mysterious owner wants to play games. He's the Celestial Toymaker, and he has already defeated the Doctor, whose essence is hidden inside a ventriloquist's doll. The Doctor is gone. The TARDIS is lost. But the game is only just beginning...