THE DOCTOR, HAUNTED BY THE DEATH OF CLARA, steps out of a teleport tube into an ancient stone castle. He is relentlessly pursued by a hooded figure, but as it reaches out its talons the Doctor shouts out loud that he is scared of dying. The figure freezes. Suddenly hidden gears turn and all the levels of the castle rotate like a huge puzzle. The Doctor eventually deduces the creature stopped when he made a confession – he is being subjected to an elaborate interrogation.
When the figure next threatens the Doctor, he jumps out of a window and narrowly escapes drowning in the sea beneath, finding it littered with skulls.