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When secret plans for the U.S. Navy's new range finder are stolen, enlisted man Jimmy is arrested by the F.B.I. Chief Petty Officer Steve Roberts is given an envelope to deliver in Jimmy's place to an unnamed person on shore and enlists the help of Jimmy's girl friend, Carol Evans. They go to Nick Cilatto's restaurant, where Nick orders one of his men to pose as a drunk in the bathroom and frisk Steve for the letter. Carol, however, has the letter and the attempt fails. After making a phone call to Slavins, who conducted "business" with Jimmy earlier, Nick directs Steve and Carol to Joe Benje's bar, where Nick says Jimmy sold stamps. At Benje's, Slavins, who is unsure of Steve, refuses the envelope, and the unnamed boss gives orders to have Steve followed. Benje tells Steve the "stamp man" wants him to call at 267 Malone Street in half an hour. When Carol suggests they take a ride in the park instead of delivering the envelope, Steve kisses her and proposes. At the Malone Steet apartment, Carol waits in the cab while Steve walks in on a poker game. One of the spies offers Steve $500 for the envelope, but he gets nervous and says that Jimmy should handle the matter himself. The men then search Steve, but once again Carol has the envelope. She is eavesdropping on the fire escape and after learning the name of the boss, Cronjer, calls him to deliver the envelope herself. Steve escapes through a window and jumps into Carol's departing cab. She tries to elude Steve, but he follows her to Cronjer's. Upon receiving the envelope, Cronjer rejects it and orders his men to "take care" of Carol. Meanwhile, the spies investigate Steve and find out he is supposed to be in the brig with Jimmy. The man posing as Steve is a G-man. The gang binds and gags Steve, and Carol, who has escaped her captors, returns to rescue him and calls the police, who apprehend the spies. A few days later, Carol, who is really special agent Matthews, meets Steve in a Naval Intelligence office and realizes that she and Steve, whose name is Fletcher, have both been working undercover. Fletcher and Matthews are then promised a shared assignment in Honolulu.