Steve Carter (Stephen Dunne) has been released from prison after serving time for arson against his employer - a radio DJ service, Dr Ordway (Warner Baxter) having testified that he was not insane. Carter is out to prove his innocence and wants Dr Ordway's help.
However, soon Steve's former boss is found murdered, Steve is a suspect and goes on the run but Ordway suspects that someone else did the crime, and indeed the culprit when finally unmasked is most unexpected...
This is a fine crime B-movie and an excellent way to end the series with plenty of fast moving action and puzzles. Lois Maxwell stars as a person who ends up very central to the case.