The first book written during the show by Castle about the fictional character Nikki Heat (inspired by Beckett).
During the show the character Castle is shown to criticize peoples grammar and use of the english language. However the first half of this book has a fair few errors and typos (should have been picked up in proof reading) making the book lose the rhythm it was picking up.
The book is quite short, just under 200 pages and is therefore lacking a bit in the plot department. The pace is quite slow at the start but picks up pace well during the last few chapters.
Caskett fans will be pleased that the characters inspired by their ship do get the relationship yet to be shown on the show. Fans will find the same style of humour used in the series however I personally would have liked more of Ryan and Esposito's counterparts (with a couple name of Roach).
Due to the shortness of the book, typos, and lack of a great mystery plot I would hesitate to recommend it to people who aren't fans of the show.
For fans it is a nice piece of memorabilia to go along with the dvds and a light summer read, I have read the follow up 'Naked Heat' which is better and am awaiting the next instalment.