The Killing Hands by P. D. Martin

Book trailer for PD Martin's (@pdmartin1) The Killing Hands, book 4 in the Sophie Anderson series. In The Killing Hands, a victim has literally had his throat ripped out and the trail leads back to LA's underworld and a brilliant killer who's carved a trail of death in organized crime across the U.S.
(From the YouTube description)
via @chrismingryan

Publisher: Mira; Original edition (November 1, 2009)