A Shadow of Doubt: Brotherhood Protectors World (Shadow Ops #2)
Kate Mckeever, Brotherhood Protectors World

Clay Watson overcame a childhood filled with drugs to become a Marine and Shadow Ops agent. He reluctantly accepts a job to protect Sierra when she witnesses her brother’s murder by a drug cartel.
As they work to fulfill her mission, Sierra and Clay have to overcome doubts about who they can trust and about each other. Their attraction grows but will it be strong enough to help them survive this drug war?