Fired from his skiffle band, Francis Henshall becomes minder to Roscoe Crabbe, a small-time East End hood, now in Brighton to collect a debt from his fiancee's dad. But Roscoe is really his sister, Rachel, posing as her own dead brother, who's been killed by her boyfriend, Stanley Stubbers. Holed up at The Cricketers Arms, the permanently ravenous Francis spots the chance of an extra meal ticket and takes a second job with Stanley Stubbers, who is hiding from the police and waiting to be reunited with Rachel. To prevent discovery, Francis must keep his two guvnors apart.