A group of prisoners are encouraged to form a jazz band and vow to go straight when they are released to tour the country. However, the trumpets and clarinets are just a cover for a series of robberies. Musical comedy, starring British jazz star Acker Bilk as himself, alongside Jimmy Thompson and Jennifer Jayne.

Jazz musician Acker Bilk and his band play four music sets in different studio sets. A musical treat that is as exciting to look at as it is delightful to hear.