I'm really of two minds about this book - the info about Shakespeare and all of the possible candidates for the "Who was Shakespeare?" sweepstakes was absolutely fascinating, and I really appreciated the author's note at the end, which outlines which parts are fact, which are somewhat fictionalized for purposes of her story, and which are entirely made up. However, the modern mystery was fairly predictable and reminded me in places of a Gothic romance - i.e., is the mysterious man who helps Kate Stanley someone to be trusted, or is he actually a Bad Guy who is using her? The answer was uncovered with a bit of a twist, which was sort of nice, but still - it seemed that much less thought went into that aspect. Still, I'm a sucker for books about books, and this was a fun read.
There's a second Kate Stanley book out (of course, because it seems no one can write a damn stand-alone book any more), which I will probably read if I come across it for cheap.