Think Fast, Mr. Moto was the first of 20th Century-Fox's movie series based on the wily Japanese sleuth created by J. P. Marquand. Moto (Peter Lorre) seems to be a criminal this time around, involved with a gang of international smugglers. Virginia Field is a White Russian expatriate who likewise appears to be an agent of the criminals. The adventure takes Moto, Ms. Field and the son of a legitimate gem dealer (Thomas Beck) from San Francisco to Shanghai. During the inevitable showdown with the head of the smugglers (Sig Rumann), Virginia turns out to be an unwilling pawn of the crooks, while the inscrutable Mr. Moto reveals himself to be a special agent of the International Police.
by Hal Erickson synopsis