“It’s a funny thing,” admits Elizabeth Winkler. “I don’t really like controversy. I don’t seek it out. There are some people that thrive on it and I don’t. I find it upsetting and distressing to see my work and my ideas misrepresented and twisted. It’s not fun. But you study the history of the subject, you know that’s how it goes.” The subject in question is perhaps the final blasphemy of British culture: the theory that William Shakespeare of Stratford-upon-Avon might not have written Hamlet, Macbeth, A Midsummer Night’s Dream, and other plays and poems that bear his name. The...