Release Message:  The Doctor (Peter Capaldi), alone and depressed, finds himself inside a nightmarish castle seemingly created to terrify him. However, as the Doctor soon finds out, everything is not quite what it seems to be.

Description:  Trapped in a world unlike any other he has seen, the Doctor faces the greatest challenge of his many lives. One final test. And he must face it alone... The Doctor, alone and depressed, finds himself inside a nightmarish castle seemingly created to terrify him. However, as the Doctor soon finds out, everything is not quite what it seems to be. The Doctor must solve the riddle of his prison in order to find out where he is and why he is there.