The charismatic Peter Lorre stars as Mr Moto, a cunning international policeman, who is working undercover to not just to bust up a criminal outfit called the league of assassins, but to uncover the ring leader. Consequently he foils an assassin en route. What I loved was how smart he was, fooling his enemies into thinking he's meek. Why, he throws some of the bad guys around with judo throws and leaps at one villain like he's jumping off a trampoline. Great fun.