Escaping from their burning plane in the first chapter of Universal's wartime serial Adventures of Smilin' Jack, Jack (Tom Brown) and girlfriend Janet (Marjorie Lord) discover to their horror that Jack's parachute refuses to open. Just as he is about to slam into earth, Jack finally manages to pull the string and both land safely. Aided by local farmers, the two are shown the way to the city of Mandon, where Janet's brother, Tommy (Edgar Barrier), has learned of a secret passage from China to India. Axis agent Fraulein Von Teufel (Rose Hobart) has ordered one of her henchmen, Yoshudo (Jack Gardner), to track Jack, who is in the employ of Chinese general Kai Ling (Sidney Toler). Having arrived before our heroes, Yoshudo is about to persuade Mandon leader Mah Ling (Cyril Delevanti) to draw a map to the secret passage when Jack and Janet arrive on the scene. All are arrested, but Jack manages to escape and sabotage the Japanese airplane. Discovered by the enemy, Jack, Janet, and Tommy seek sanctuary with Mandon high priest Lo San (Nigel de Brulier), but are followed by Yoshudo, who shoots Jack at point-blank range.
~ Hans J. Wollstein, All Movie Guide