Checkmate

AU of 'Nightmare In Silver'. Things go terribly wrong for the Doctor and he has no choice but to retreat in the face of Mr. Clever. Clara escapes his clutches, and now with the obsession and memories of the Doctor infecting the Cyberiad, Mr. Clever will hunt her down to the ends of the Universe. But can the Impossible Girl out-flank Mr. Clever? She is the Universe's only hope...