So when I got home and googled it, I found out that Woman with a Fan was stolen in 2010 and is indeed a Modigliani. (And a Braque was stolen in the same heist! Maybe the author did it.) It also led me to a twitter post where someone asked the same question, and someone else replied, "Yes, it's a Mod." I guess if you're cool you will just call him Mod but I like saying his last name enough to get a dog and name it Modigliani.
If I'm going to be haunted by an artist I'm glad I at least enjoy the artwork.
The morale is that there is something to be learned from books, even the ones with tedious references.