Bulldog Drummond goes up against foreign agents trying to steal plans for a top-secret aircraft.

Captain Drummond travels to Switzerland in order to marry his girlfriend but the disappearance of a dangerous cargo of explosives makes him delay his plans.

On the eve of his wedding Captain Hugh Drummond is off to Morocco when Scotland Yard's Colonel J.A. Nielson is kidnapped by international criminal Richard Lane. With his fiancée Phyllis Clavering, friend 'Algy' Longworth and his trusty valet 'Tenny' Tennyson, Bulldog flies his own plane 1200 mile...

Captain Hugh C."Bulldog" Drummond (John Howard) and his ever-loving and patient fiancée, Phyllis Clavering (Heather Angel). are about to wed but he becomes involved in a plot to steal an atomic disintegrator with a range of half-a-mile. Madman Rolf Alferson (George Zucco)has control of the weapon...

Captain Drummond and his girlfriend want to marry but a hidden treasure in the house in which they want to celebrate their marriage is complicating the situation.