Bulldog Jack (aka Alias Bulldog Drummond)

Master sleuth Bulldog Drummond pulls into a gas station where his car is sabotaged by crooks. Minutes later he crashes into Hulbert's vehicle. In the hospital, the injured Drummond asks Hulbert to temporarily masquerade as him. His job is to help the desperate Fay Wray (who seldom looked more beautiful) find her jeweler grandfather who has been kidnapped by the same gang that sabotaged Drummond's car. Hulbert, of course, takes the job far more seriously than intended.