It's Three Kings Day at the Montoya family rancho, and they've welcomed guests, included Don Javier, an old beau of Tia Dolores, who is now Josefina's stepmother. He has brought Tia Dolores a beautiful ruby ring which is an inheritance from her aunt. Also visiting is Senor Fernando, a man who is considering buying a horse from Josefina's father. During the festivities, the ruby ring disappears. Could Don Javier be the culprit? Senor Fernando? Or is it the strange man Josefina has seen hanging around near their hacienda? And why does Tia Dolores seem so dispirited? Can it be she regrets coming to the rancho and marrying Mr. Montoya? Or who is it? This is a great mystery that is great for any age including adults.