Another unmemorable entry in a four-movie series starring Conrad Nagel and Eleanor Hunt as federal agents, here trying to rescue a kidnapped inventor (who happens to be a naval officer) to prevent other powers from getting his newly developed formula for a concentrated aviation fuel. The banter between the leads is a little heavy (a weakness of the other entries as well), but both are given adequate opportunity to contribute to the investigation and action.

  Mildly recommended. Otto judiciously thinks this movie is OK, but not great.

Movie 108 for 2021.