When Don Aguilera is shot, his son assumes the would-be assassin is Don Fuentes since he recently had a violent argument with the young man's father. The Queen of Swords intercepts the assassin sneaking into Dr. Helm's surgery and discovers the intended victim was the doctor, not the don. While Dr. Helm is spurning the Queen's offer of help, the would-be assassin strikes a deal with Colonel Montoya to help each other rid themselves of their adversaries.
—David Bassler