Perry (William Gargan) is trying to interview a reclusive scientist, while he is at the scientist's home trying to get to see him a shot is heard and the scientist is found dead. The murdered man's secretary Lois (Marguerite Churchill) helps Perry try and unravel a complicated case involving business rivals, military secrets and anti-war sentiment...
This is a typically fast moving crime drama with plenty of suspects and red herrings before we get to the final act and a fairly ingenious murder method. The plot is a bit hard to follow at times though but it doesn't really spoil the enjoyment that much.
One interesting part of the film is early on when we see the scientist Stava (Egon Brecher) arrive back in the USA from Europe on the Hindenburg zeppelin!