I heard Foster interviewed on the radio and was pleased to find that I could still get his book out of the library. Foster is a pioneer in the field of literary forensics. He uses comparative analysis of texts to try to determine the authors of unknown works. He is the professor who discovered the identity of the writer of Primary Colors and helped nail down the identity of the Unabomber and the man who wrote Twas the Night Before Christmas. He writes in a chatty easy-to-read style about cases he’s worked on and problems he’s had along the way -- Joe Klein, the revealed Anonymous from Primary Colors, denied being the author of the book for six months while Foster sweated it out. I found this book really engaging and a fascinating look at lexical patterns and how they can reflect a personal identity.