AllMovie

Leslie Nielsen guest stars as Tom Sebring, a disgruntled prison inmate who has unexpectedly been denied parole. Elliot Ness (Robert Stack) hopes to play on Sebring's resentment to persuade him to act as an "inside man" at Leavenworth, the better to trap the partners of recently murdered mobster Nick Segal (Peter Leeds). But Ness' plans may be thwarted by a corrupt prison guard and a phony "escape" designed to cover up a second murder--and pulling the strings on the "outside" is none other than Frank Nitti (Bruce Gordon.