A fighter with an X painted on it shoots down an airliner. A number of suspect pilots are bought together into a room, which has been covered in 1930s state of the art surveillance technology so the suspects can be listened in on.
However, this doesn't really lead to anything and the suspects are whittled down one by one until the final showdown between Blackwood (John Carroll) and Pilot X while his gal Helen (Lona Andre) watches on...
This is a rather dry crime drama, it doesn't have the snappy dialogue, gloomy atmosphere or fast moving action which usually makes these kinds of films from the period entertaining. However, the aerial dogfight scenes are excellent and make up for the lackings elsewhere. Not brilliant but worthwhile.