Convicts Dodger (Peter Sellers), Jelly (David Lodge) and Lennie (Bernard Cribbins), along with fake vicar Soapy Stevens (Wilfrid Hyde-White), come up with a perfect jewel heist.
The idea is that the convicts escape from HM Prison Huntleigh, effect their robbery, then return to the prison on an iron-clad alibi. Unfortunately, tough new warden Sidney Crout (Lionel Jeffries) throws a spanner in the works.
A simple plot is used to maximum effect in this quaint British caper comedy.
Soapy Stevens/Rev Basil Fowler
Commander Horatio Bennett RN
Chief Police Officer Sidney Crout
Chief Police Officer Jenkins