Dennis (Hywel Bennett - Percy) and Hal (Roy Holder) are inseparable. They are also irreverent, boisterous, highly sexed and eager to acquire a quick fortune by the most expedient method... robbery. Only problem is they have to hide their loot. Fortunately Dennis works as an undertaker so a coffin seems like the perfect place to hide it. But from the moment they try to fit the loot and a body in the coffin the plans go wrong... and soon the boys have trouble on their hands in the shape of a gold digging nurse and the dreaded Inspector Truscott (Richard Attenborough).