At one hour running time, this couldn't even be considered a "B" movie. I suppose it defines the term programmer. Whatever it is, and however much it cost to produce, I think it's a winner. The legendary director, Eddie Cahn, manages to take an unknown cast and a dime store plot and turn it into a tight little mystery. Cahn, like Bill "One Shot" Beaudine and others were masters at using pocket change to turn out two reelers that are somehow able to capture the viewers attention. The plot, such as it is, involves the Army using radioactive isotopes on convicts from Alcatraz to help find a cure for a mysterious blood disease. (I wonder what the ACLU would have to say about that today). The experiment backfires and the hero begins to smell a rat. With the help of his nurse, his investigation leads to a criminal conspiracy involving the head rat - or the head guinea pig. But enough about that. Ignore the story and the unknown and mostly untalented cast. Enjoy the mystery, the pace, and the trip back to the land of double breasted pinstripe suits, Studebakers, and cliches. I voted 8/10