Three criminals plan to break out of prison the day before their release in order to carry out a daring jewel robbery, intending to establish the perfect alibi by returning to jail afterwards. First however they must get out, a task made more difficult by a new, stricter prison officer.

Peter Sellers

Dodger Lane

Wilfrid Hyde-White

Soapy Stevens

Maurice Denham

Governor Horatio Bennett

Irene Handl

Mrs. Price

David Lodge

Jelly Knight

Lionel Jeffries

Chief Prison Officer Sidney Crout

Liz Fraser

Ethel

Bernard Cribbins

Lennie Price

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