All Janet Martinez's novels are available for free through Kindle Unlimited.
The cover of Drop Dead Killers caught my attention and the book's story kept it. David Graham is a Washington, D.C., police detective tasked with finding who's killing attorneys in the nation's capital. While there is no shortage of people who would like to see the attorneys dead, the killer eludes David until the surprising finale. The author is a former paralegal and that experience lends authenticity to the book.
Be warned, the David Graham books are not for the squeamish. They are a violent thrill ride and Janet Martinez doesn't skip on the details.