She was working from history books: some about the Burke and Hare case, others about the history of medicine in Scotland. The Edinburgh Room at the Central Library had proved helpful as ever, as had a contact at the National Library. Both had done photocopying for her. She’d taken a trip to Surgeons’ Hall, too, using their library and database. Hadn’t told Rebus about any of this. She knew why: because she was worried. She felt that the Arthur’s Seat case was a blind alley, and one down which John, with his need for answers, might go careering. Professor Devlin had been right about that: obsession was always a trap into which you could fall. This was history – ancient history, compared to the Balfour case. Whether the killer had known about the Arthur’s Seat coffins or not seemed irrelevant. There was no way of telling. She was conducting this research for her own satisfaction; didn’t want John reading anything more into it. He had enough on his plate without that.

There was a noise in the corridor. When the kettle clicked off, she thought no more about it. Poured the water into her mug, dunked the tea-bag a few times, then tipped it into the swing-bin. Took the mug back into her room, leaving the door open.

Kennet Lovell had arrived in Edinburgh in December 1822, aged barely fifteen. She couldn’t know whether he’d taken a coach, or walked. It wasn’t uncommon to walk such distances in those days, especially if money was an issue. One historian, in a book about Burke and Hare, speculated that Reverend Kirkpatrick had provided for Lovell’s journey, and in addition had given him an introduction to a friend, Dr Knox, recently returned from time overseas, during which he had worked as an army surgeon at Waterloo and studied in Africa and Paris. Knox had housed young Lovell for the first year or so of his life in Edinburgh. But when Lovell had started university, the two seemed to have drifted apart, and Lovell moved to lodgings in West Port …

Jean sipped her tea and flipped through the photocopied sheets: no footnotes or index, nothing to indicate the provenance of these apparent ‘facts’. Dealing as she did with beliefs and superstitions, she knew how hard it could be to sift out hard objective truths from the chaff of history. Hearsay and rumour could find their way into print. Mistakes, only occasionally pernicious, crept in. It galled her that she had no way of checking anything, had for the moment to rely on mere commentary. A case like Burke and Hare had thrown up any number of contemporary ‘experts’, who believed their testimony to be the one true and worthwhile account.

It didn’t mean she had to believe it.