"What. . . . .?" said Jasmine, and Riddle gave an apologetic shrug: "it's a new ringtone one of my daughters put on my phone," and held it up, "it's a message from. . . . ." but Jasmine interrupted him: "not the bloody song, I saw a face, behind you!" and: "oh, sorry, it's just me," said another youngish man, stepping into the torchlight, as Riddle relit the storm-lamps then introduced the apparition: "this is Felix Rosenstiel, he's in the League too, he's a Social-Geographer and it was thanks to him we found this place," and then Felix spoke: "there were some old mediaeval maps of Edinburgh in the Sasines at Register House, and when I put an overlay of the High Street as it is now, we could see all the old closes underneath the modern buildings, and not just Mary King's," and Riddle: "so when we looked closely around Elginbrod's Chambers, we realised that the building was over Spud Tamson's Close and that there was a rear access to the dungeons under the Old Tolbooth," and Teri asked: "so this was a dungeon?" and Riddle nodded, and Felix said: "we got a tracker and Riddle put it in Elginbrod's coat and I was sitting on a bench outside, and had schematics of the area on my laptop," then Riddle: "and he was able to track Elginbrod down three flights of stairs and through a maze of passages and down into this dungeon," and Felix added: "but he left a different way – through the doorway I came in by, that leads under St Giles and then the High Street and comes out down Advocates Close, very appropriate!" and Riddle laughed, and said: "apophenia is what distinguishes Social-Geography from what we got at school," and Felix confirmed: "lots of seemingly separate threads, or strands, that appear quite discrete, actually pleach together and explain a lot," and Riddle added: "it seems that this particular dungeon was where the sawbones dealt with prisoners who died in custody, either accidentally or of illness, even old age, which would have been anything over forty – that is not executed," and Felix went on: "sometimes the corpses were boiled down to provide clean skeletons, or interesting organs were removed and pickled, remember this was long before Burke and Hare and there weren't the same legal strictures limiting the supply of cadavers for dissection," and Riddle added: "not the number of doctors, or medical students, and a smaller population," and Jasmine said: "enough already – you two really know how to tricolate the story, are you some kind of double-act with the cross-talk?" and the two friends glanced at each other, but for once said nothing.