An archaeological dig in 1936 unearths relics of another time and, as the Doctor realizes, another place, another planet. But if Emmaline Porter, noted adventuress, has really found evidence of an alien civilization, why isn't she famous? Why has Amy never heard of her? Come to that, since she's been traveling with him, why has Amy never heard of the Doctor? As the ancient spaceship reactivates, the Doctor discovers that nothing and no one can be trusted. And how can he defeat an enemy who can bend reality itself to their will?