"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...