Kumiko saw it first. A heart - a human heart - slithering down outside the window of a train travelling between London Bridge and Blackfriars. Someone must have thrown it out from a carriage in front. Kumiko is determined to find out who - and why.
But Skelton was sitting next to Kumiko on the train and he saw it too, so he also wants to get to the bottom of the mystery. Or he says he does, but really he just wants Kumiko back, because she's walked out on him, just like that, and left him heartbroken.
Each for their own reasons, Kumiko and Skelton set out - separately - on a bizarre trail of discovery. Darting between dingy student pubs, the roofs of Borough Market and the corridors and car-parks of Guy's Hospital, they become embroiled in the seedy world of young medical students, until eventually the gossip and the stories lead them both to the hospital's infamous dissection lecturer - known behind his back as 'King Death' ...