Morton Halas is an aggressive and very successful defense attorney who will stop at nothing to get his clients off. Having successfully defended Big Mike Probich he finds himself working for Larry Coombs, another small-time mobster who has ambition to rise to the top. Coombs and his top enforcer Whitey Metz decide to knock off Probich and take over his network. They succeed but things don't go as smoothly as planned and Eliot Ness soon has an eye witness who can identify both of them.

Eliot Ness and his men are having success shutting down the narcotics trade in Chicago thanks to a series of anonymous telephone tips. Ness manages to trace the call to a phone booth and identify the caller as Nick Dulov, owner of the Windy City cab company. Dulov has stolen Nitti's 15 kilo shipment of heroin and then gives it back to him - with a proposition that they go into the narcotics distribution business together.