The main problem, though, is not eerie sensations but retrieval. Nobody knows exactly how the brain gets what it wants out of storage, but short-term is definitely involved. That brief, sometimes microscopic, time information spends in short-term is apparently used for something besides tip-of-the-tongue availability. The whole complex sort-and-file process of retrieval is apparently centered in short-term, and without it, and without the help of the drugs that put it there or artificial substitutes, information can be impossible to retrieve. I’d used endorphins for examinations and never had any difficulty with retrieval, and it looked like it was the only way to store all the information I needed in anything approaching the time I had left, but it also meant that I would never have known any of the things I needed to know, even for long enough to have forgotten them. If and when I could retrieve the information, I would know it. Till then I was as ignorant of it as if it were not stored in some cobwebbed corner of my mind at all.

“You can retrieve without artificials, can’t you?” Kivrin said, looking skeptical.

“I guess I’ll have to.”

“Under stress? Without sleep? Low body endorphin levels?” What exactly had her practicum been? She had never said a word about it, and undergraduates are not supposed to ask. Stress factors in the Middle Ages? I thought everybody slept through them.

“I hope so,” I said, “Anyway, I’m willing to try this idea if you think it will help.”

She looked at me with that martyred expression and said, “Nothing will help.” Thank you, St. Kivrin of Balliol.

But I tried it anyway. It was better than sitting in Dunworthy’s rooms having him blink at me through his historically accurate eyeglasses and tell me I was going to love St. Paul’s. When my Bodleian requests didn’t come, I overloaded my credit and bought out Blackwells, Tapes on World War II, Celtic literature, history of mass transit, tourist guidebooks, everything I could think of. Then I rented a high-speed recorder and shot up. When I came out of it, I was so panicked by the feeling of not knowing any more than I had when I started that I took the tube to London and raced up Ludgate Hill to see if the fire watch stone would trigger any memories. It didn’t.