When George Sanders announced that he was leaving the "Falcon" series, RKO Radio came up with the perfect replacement: Sanders' own brother, Tom Conway. The transition was handled with style in The Falcon's Brother, with private detective Gay Lawrence (Sanders), aka The Falcon, incapacitated early in the proceedings. Anxious to break up an Axis spy ring, Gay calls upon his brother Tom (Tom Conway) to help out. The villains intend to foment a rift in the relationship between North and South America, which Tom, with the aid of intrepid heroine Marcia (Jane Randolph) and dopey sidekick Goldy (Don Barclay), hopes to prevent. By film's end, Tom Lawrence has assumed his brother's mantle as the Falcon, and the Falcon he would remain for the next eight entries in the series.