Heat Wave

I can't see someone being interested in this if they're not already a fan of the TV show Castle, as the book is a metafictional tie-in to the show, claiming to be written by the main character in the show.

So it's a tie-in to the show, but also a parody of it - Castle (the character) is a bit of an egotistical blowhard, and the novel's character of Rook is a quite obvious work of author insertion, and very much how the author/character sees himself, as well as how others see him - Nicki Heat is madly in love with him, but refuses to admit it only and only his charm can help her overcome it.

So, tie-in, parody, and an examination of character all at once - there's a surprisingly high amount of stuff going on in this rather short novel.