I still have a hard time believing that the Richard Castle novels starring Nikki Heat are as good as they are. I just finished Frozen Heat, which is number 4 in the series. I would expect that real books "written" by a writer character on a TV series who wrote said titles would be a schlocky gimmick. But in reality, whoever is ghost-writing these novels is doing an excellent job.
Frozen Heat revolves around the unsolved murder of Nikki Heat's mother ten years ago. Heat's team gets called in to work a case involving a frozen female body stuffed in a suitcase. It's just another crime until Heat notices that the suitcase is the same one that belonged to her mother and went missing after her murder. With Jameson Rook's assistance, she discovers an aspect of her mother's life that she never knew about... one that ties the two murders together. But someone is determined that Heat doesn't uncover the past and disrupt their current plans. They've killed before, and one more death would mean little.
If you're a fan of the TV show Castle, then these novels are like watching an episode. Even though the names are different, the characters are the same, and you "see" the action playing out with Beckett and Castle. The plot and twists keep things up in the air until the end, and it's hard to put down. The dialogue is perfect with Rook playing the same type of wise-cracking out-of-the-box character as Castle plays in the series. Even if I knew nothing about the TV show, I think I'd still like the book (and the series). Since I enjoy the series, Frozen Heat is total fun.