I'm a big fan of the Castle TV show, and I wanted to like this for the tie-in value. But it's not very well written, and the banter between Heat (Kate Beckett) and Rook (Rick Castle) isn't nearly as good as the TV show. Almost any script would have been better than this disappointment. For die-hard Castle fans, it's interesting, but for a die-hard mystery fan, it's not something I'd recommend. The only reason it's a NY Times bestseller is because of the Castle fans, not because the book is good in itself.