Smalltime crook Jimmy botches a bank robbery, lands in prison and stages a musical, with his fellow British inmates, that turns out to be Act One of the perfect escape plan. The musical, about Napolean's adversary Lord Nelson, is ultimately the cover plan to orchestrate a jailbreak. But it's Act Two that's stumped Jimmy. His leading lady has captured his heart, and with one leg already over the wall, he's got to come up with a new ending... as the curtain falls fast on his freedom.