Brick Davis is a street-wise New York City lawyer who decides to join the US Department of Justice and become a G-Man after his friend Eddie Buchanan, also a G-Man, is gunned down by mobsters. Davis' schooling was actually paid by a friend, Mac McKay, a benevolent mobster who wanted to make sure that Brick didn't end up on the wrong side of the law. He hasn't been very successful as a lawyer so law enforcement seems to be the next best thing. When mobsters go on a spree of bank robberies in the US midwest, Davis is assigned to the Chicago field office. As they arrest the mobsters one by one, Davis learns that the rest of the gang is hiding out at a hotel run by his onetime friend and mentor McKay. Things come to a head when the last remaining gunman kidnaps a fellow G-Man's sister.
—garykmcd