This latest installment in the Nina Reilly series was close to a complete disappointment to me. I've read all the previous novels, following Nina through two marriages and one prolonged affair, and have always enjoyed the tales, even the one which focused on the gambling casinos and seemed to go a bit too far off-tangent. But this one was nearly incomprehensible to the average reader. Other reviewers have criticized it for the same reason: the mathematical mumbo-jumbo was entirely too complex (and definitely off-tangent)to be enjoyable reading. If I'd wanted to study a math textbook, I'd have bought one. While a writer needs to introduce sub-plot and the sisters here have seemed to do a lot of research, it doesn't always make for a good read. I'm a fan of the TV show, Numb3rs, which easily makes math look interesting---this book does not. It was a disappointment and a real drag at times. Nina, too, is starting to get on my nerves---she cannot commit in any personal relationship, and she vacilates back and forth between being bright and being fairly stupid in her cases. Flawed heroines are all well and good, but growth is essential. Let's pick up the pace, or this series is going to languish.