I really love this series. Darynda Jones keeps pushing the story forward at such a great pace. In the previous book Third Grave Dead Ahead Charley was taken hostage and tortured by Reyes's "dead" father. Betrayed by Reyes by being used as bait to catch his father, Charley told him she didn't want anything more to do with him. 
 Fourth grave opens two months after the events of the previous book. Charley has been sequestering herself away in her apartment going a little overboard on the home shopping network. I like that Jones chooses to keep the tone light even though it could easily have slipped down into the dark place that Charley is in at the moment. 
 This time, Charley is drawn out of her apartment / shell by a new client, Harper, who claims that she's been receiving threats since she was five. Even though her family doesn't believe her, she is determined to figure out the mystery. That's where Charley comes in. 
 Meanwhile, Charley knows that she can't just dismiss Reyes completely. When she sets out to find him she learns that he has been participating in cage fighting. Obviously, not one to just sit back and watch. She goes to confront him. I like that about Charley. Of course with what she's just been through Charley is a little more cautious than she has been previously, but that doesn't diminish her crazy personality. 
 We learn a lot more about who / what Charley is. I like discovering things about the grim reaper as she discovers them herself. 
 Jones also does not disappoint us on the relationship between Reyes and Charley. They really get a lot of time together in this book. I liked the turn that their relationship took. 
 There's some intersting twists and ideas introduced in this book and I am interested to see where Darynda Jones takes us in the next book. 
 The only thing that I can complain about is that I've again read through this book too fast and now have to wait for the next book in the series Fifth Grave Past the Light which I believe will be out in summer 2013. Until Then!