A CBA Bestselling Author Defenders of Justice (Book 1) Mercy Brennan followed in her father''s footsteps in a law enforcement career, but she has no interest in any other connection to him. A U.S. Marshal in St. Louis, Missouri, she''s assigned to a joint task force with the St. Louis PD that puts her back into contact with her father and in the sights of St. Louis''s most powerful gang.