She Might Be the Mystery He Cannot Solve It is post-Civil War America. Reggie Poole, a precocious teenage girl, must travel into the war-torn South. She finds violence is commonplace, and Northerners are unwelcome on her journey to find her biological father. He is not any man; he is R. Edwin Easley, the famous British detective known as Mr. REE. When two men are murdered in an antebellum plantation, and Reggie is connected to both crimes, Mr. REE takes on the case with his assistant, Sally-Ann Primrose, who competes for his attention. The more Reggie learns about her father, the more she realizes the enigmatic detective hides dark secrets involving his fragile mental state, a mysterious pocket watch, and a hidden room. If she can help him solve the mystery-and not be killed in the process-she just might win him over.