As Campanella Fruhling's train speeds on, bearing disaster to the Underground and its denizens, Bishop gives Heine more clues to his past. But the aims of Bishop, who wears his own collar, are unclear: why is he revealing these things now, and why did he save Heine in the first place? Meanwhile, Badou takes on another freelance job from Granny Liza to gather information - and soon discovers it was the information that his brother died pursuing...