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In the Burmese boom town of Lashio, a convoy of ammunition is being loaded at the headquarters of the Southwest Trucking Co., under the direction of American Cliff Weldon and his friend, Smitty. After the trucks are loaded, Cliff, Smitty and hotel manager Ann McBragel go to the Burma Road Café, where Cliff has Smitty sing "Jeannie with the Light Brown Hair." Cliff then announces his resignation to his boss, Victor Harrison, and his plans to return to the safety of Kansas City and a job at an automobile garage. The convoy leaves that night, and is unsuccessfully attacked the next morning by a lone airplane. Cliff returns safely to Lashio from Chungking, only to discover that his younger brother Mike, an aviator, has arrived from Shanghai to join the convoy. Despite his brother's objections, Mike insists on staying in Burma, and the brothers are then later attacked by an Eurasian prowler trying to steal Mike's luggage. When Mike opens his luggage, he discovers that the bag is not his, as it contains instructions for a parachute attack on the Burma convoy. After Cliff convinces Mike to return to Kansas City with him, Ann agrees to go out with the two brothers for their final night in Lashio. While Cliff and Ann dance, Mike spots the Eurasian who attacked him. Mike tells Victor that he has found the thief, but is murdered before he can tell the man's whereabouts. Later, British magistrate Major Hart holds a meeting of the Burma Road transportation counsel, during which Cliff announces that he is staying in Lashio until he avenges the death of his brother. Ann tells Cliff that Mr. Yuchau, a new member of the transportation counsel, was supposedly on Mike's train. When they fail to gain any evidence against Yuchau, Cliff agrees to lead the next convoy to Chungking. Cliff and Ann then follow Yuchau to a warehouse, where they find Mike's murderer, dead. Yuchau then appears to be trying to kill them, so they rush to Major Hart's offices with a note written in Chinese that they have found. Cliff seeks out Victor to translate the note, only to have Ann discover that Yuchau is actually a Chinese agent who has been tracking the murdered Eurasian spy. In the meantime, Cliff discovers that his old boss is the actual spy. Before Cliff can apprehend Victor, however, one of the spy's henchmen knocks the trucker out. Victor then leads the convoy to Chungking, just as Cliff is discovered in Victor's closet. Major Hart and Cliff form a posse to go after the convoy, and Ann sneaks along. The posse catches up with the convoy just as a Chinese guerrilla parachute battalion captures it. They successfully attack the guerrillas, and Cliff kills Victor, much to the chagrin of Ann's father Angus, an insurance agent who had written a five hundred dollar policy on the spy. To Ann's delight, Cliff then announces that he is staying in Lashio and takes back his old job.