![Peter Sellers](http://image.tmdb.org/t/p/w92/sCVIv2DGoC9U16anTjLwMxKBPZ.jpg)
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.