Who Review - The Magician's Apprentice

The Doctor is gone from the universe - friends and enemies alike can find him nowhere. When even the Daleks can't track down their ancient foe, and the Doctor’s old friend and nemesis, Missy, is forced to ask for help, does it mean that the mad man in the box has truly disappeared? What fear, or what terrible shame, could possibly drive the Doctor into the shadows? The answers are more dreadful than Clara’s worst imaginings, and she finds herself embarking on a journey into the Doctor’s worst nightmare …