"So this is it. I'm on a vampire world, with an alien who's hunting for hunks of perspex, sitting in a meat locker, preparing to die. Still, it could be worse."
Centuries ago, the climax of a great quest took the Doctor to the planets Atrios and Zeos, where he ended years of nuclear war and finally assembled the great Key to Time.
But now the Doctor finds himself drawn back to Atrios, where things aren't quite being as hunky dory as they should. No sooner has he landed than Grace is kidnapped; no sooner is she rescued than Princess Astra is carried off.
Someone is after the Key to Time. But who? And can the Doctor get to it first?