That's how fast the movie unfolds. I think I followed the plot well enough to understand what happened, but I'm not sure. As near as I can tell, there was one unresolved murder, but it didn't affect the story one way or the other. It was also never explained how Preston Foster could be a suspect in one of the murders - he was a detective trying to solve it, after all. I guess it was to inject some humor and make the Police Dept. look comical. Never understood why 30's movie audiences bought the premise of mixing comedy into murder mysteries. To me they're like oil and water.
There are lots of unexplained bits of trivia, coincidences and non-sequiturs, too many to mention here, but that kind of thing devalues the storyline and serves only to break the viewers concentration - and with this picture one needs all of one's concentration. The cast was serviceable, especially Preston Foster as the hero, and it was fun to see Bill Elliott before he became a cowboy star. But the break-neck pace makes me think I should see it again, to catch what I missed the first time - so my rating is a holding grade. I'll get back to you.