In Washington D.C., Jones receives a telegram from Los Angeles asking him to secure rights to a newly designed airplane from inventor F. S. Reynolds. Later that day, Cardigan, a gangster, lies to Jones that Reynolds is not really interested in his offer. Cardigan tries unsuccessfully to buy the plane and its plans from Reynolds. Hal Foster and his girl friend, Reynolds' daughter Jean, arrive and Hal throws Cardigan out. Afterwards, Hal test flies the plane and as he and Reynolds discuss its problems, Cardigan's henchmen arrive and steal the plane and the plans. Hal follows their car on his motorcycle and Berty, Hal's goofy friend, follows in a car. Hal catches up with the henchmen and they engage in a brawl. After Berty arrives, he and Hal go to Cardigan's Chinatown home, but Cardigan's Chinese butler refuses them admittance. As Cardigan phones Jones to let him know that the airplane is secure at an abandoned desert airfield, Hal and Berty break into his headquarters and overhear the location of the plane. Hal is captured, but later Berty, disguised as a Chinese servant, releases Hal and they use one of Reynolds' planes to fly to the desert airstrip. A government agent, who is also a pilot, arrives at Reynolds' searching for Cardigan, and Jean guides him to the secret airfield. Cardigan's henchmen see Hal's approaching plane and try to chase him down, but he jumps from his plane into theirs and upon subduing them, lands the plane. Jean and the agent arrive. The agent arrests Cardigan and his men, and Jean and Hal embrace.