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.

Michael Redgrave
as Percy Brand

Robert Morley
as Judge Sir Edward Crichton

Lionel Jeffries
as Major Proudfoot

Ronald Squire
as Colonel Masters

Elizabeth Sellars
as Gina Laselle

Joan Hickson
as Aunt Florence

Jeremy Burnham
as Colin Brand

Brenda Bruce
as Mary Cooper

Brenda Bruce
as Blacky

George Coulouris
as 'Bennie' Bensuson