Rick Riordan 
Mission Road 

Ralph Arguello is a one-time criminal, now married to San Antonio policewoman Ana, and a friend of private investigator Tres Navarre. When DNA evidence emerges, tying Ralph to a long-unsolved underworld killing on Mission Road, and Ana turns up murdered, Ralph runs to the only person he knows can help him.On the run from a city-wide manhunt, Tres arms himself and heads back to seedy Mission Road in a bid to discover what really happened eighteen years earlier and clear Ralph’s name . . . but some secrets are better left buried.A classic of Texan tension, Mission Road is the dramatic sixth book in the multiple-award-winning suspense series by the internationally bestselling author of the Percy Jackson novels.