Once upon a time, about 10 years ago, I thought maybe I could write a mystery series about a midwife in Elizabethan England. I had an elaborately convoluted title and an elaborately convoluted plotline, and at that point I got stupendously bored.

My niece was very much caught up in the vampire craze for young adults, and she thought having a vampire boyfriend would be a cool thing. What do you do on a first date? The more I thought about it, the more fun I had imagining what you'd serve a vampire for dinner.

As a historian, I love every little detail, but whole long passages about wood paneling and journeys on horseback and every stop at every inn had to go out the window. I decided the history in the books should be like spice in a soup - a little went a long way. Like cilantro.

I'm a storyteller, and I have really good material to work with: I've been studying magic and the occult since about 1983.

I'm a professional non-fiction reader, that's what I do. But in my 20s we had our own vampire and witch moment, courtesy of Anne Rice, whose books I read and loved.

I teach 18- to 21-year-olds - the 'Harry Potter' generation. They grew up as voracious readers, reading books in this exploding genre. But at some point, I would love for them to give Umberto Eco or A.S. Byatt a try. I hope 'A Discovery of Witches' will serve as a kind of stepping-stone.