I could be extremely biased in giving this book 5*'s purely because I love Castle!!
This is the fifth Nikki Heat novel which ties in to the TV show Castle and follows on from where Frozen Heat ended with Nikki still trying to find the people behind her mother's murder - something which ties in to Beckett's story on the show. Nikki ends up juggling 2 cases, still investigating her mother's case along with a new serial killer that ends up targeting her. This case also bears a resemblance to a case that Beckett and Castle investigated in Season 2 - the 2 part one which had Dana Delany as an FBI agent - where someone targeted Beckett referring her to as Nikki Heat and trying to outsmart her.
There are so many nods to the TV show and to Nathan's time on Firefly. Even going so far as to say that that Nathan fellow would be great to play Jameson Rook in a Hollywood adaptation of his articles about Nikki Heat. Also having two detectives called Malcolm & Reynolds. Plus there are characters in the book using the same names as characters from the show.
Although this series does stand alone as a good read with great storytelling I know that I enjoy them more simply because of my love for the show.
I'd love to know who the actual author is - unless Nathan Fillion has been working hard behind the scenes and has gone method in writing these books!!
Another great Nikki Heat book - they just keep getting better with each one.