The Heart of Darkness Club by Gary Reilly is the third book in the Asphalt Warrior series. Murph continues his streak of pledging to not get involved in the personal lives of his fairs and continues to fail. Murph once again finds himself involved in a police investigation due to involvement with one of his passengers. It's a bit hard to say anything more than that without giving anything away.
Though I haven't read the first book in the series the second and third work well as standalone books. The sense of humor that Murph has really makes the book stand out. There is always a bit of a serious situation going on and it makes the irreverent thoughts and comments by Murph that much more amusing. I really enjoy the writing style that Gary used for these books. This is another series that I will be keeping an eye out for future releases.