When ship's fireman Peter McCabe walks out on his long-suffering wife, he leaves her impoverished, with two young daughters and a boy born soon after his departure. After an absence of fourteen years McCabe returns, sacked and humiliated, trailing trouble in his wake.
Men from Scotland Yard and military intelligence build a dossier on a sabotage ring.
When Percy Brand, a habitual confidence trickster, keeps being sent down, he goes to great lengths to ensure that his son Colin, does not find out about his criminal past. But when Colin becomes an assistant to the Judge, who is about to try Percy for his latest escapade, Percy and his gang have to come up with a plan, to stop them meeting in court.
