Japanese detective Mr Moto (Peter Lorre) of the international police is drawn into a plot to try and draw Britain and France into a war. A French fleet is en route to join a Royal Navy fleet on joint maneuvers but is delayed at Port Said because of warnings of sabotage from the British secret service. Plotters led by Fabian (Ricardo Cortez), who is posing as a ventriloquist in a rather mediocre music hall act, try to get rid of Mr Moto though he manages to escape.
Fabian and his men discover a British secret agent (John Carradine) and kill him. Fabian's girlfriend Connie (Virginia Field) helps him track Moto, unaware her man is a brutal agent, but she soon finds out the truth...
It is all nonsense of course and pretty corny but the strangeness carries you through. A brutal agent who talks of blowing up warships one minute and then makes cute lines through his ventriloquist's dummy the next. As for Mr Moto, he is as "oriental" as Mr Wong or Charlie Chan.