Honoring a promise to a fallen comrade, former army medic David Evans heads to Arizona to check up on the soldier's sister. But as his train pulls into Desert Valley, David witnesses a drug run gone wrong and narrowly avoids the bullets flying his way. And when the police show up, he discovers the investigating officer is the woman he's supposed to look after. With a fiercely protective K-9 partner and a new badge, Whitney Godwin insists she can take care of herself and her infant daughter. But the criminals want both David and Whitney permanently silenced, so David will stop at nothing to protect the family he yearns to join.