The Civil War is over, but Cassidy's War is just beginning. Cassidy Stuart longs to attend medical school. Training beside her physician father and serving as a nurse during the war have only increased her desire to be a doctor with her own practice. When the man who left her at the altar returns, she's determined not to let him upset the plans she's set for herself. Until his mission is accomplished, George Masters must hide his identity as a Pinkerton agent as he investigates a physician living in George's former hometown, only a short distance from Cassidy's home. When he finds Cassidy hasn't married, he hopes he can rekindle their love while trying to protect her and the townsfolk from the evil Dr. Madison. Can their love be renewed despite the villain's desire for revenge against them both?