The FBI, investigating the theft of plans for a new cobalt bomb, comes across a Communist spy ring. One of its members is Juliet Sinclair, who runs an Asian orphanage and also an operative for Red China. She is flying to Los Angeles to take a girl from the orphanage to a couple, the Kenyons. The girl, however, the night before the trip, discovers Juliet Sinclair's secret. What the girl doesn't know is the Kenyons are part of the same spy ring. Erskine and Rhodes must not only recover the missing information but also are in a race to prevent the girl from being liquidated by the Kenyons.
—Bill Koenig