Waiting for good friends Betty and Vic to arrive for Henry's birthday dinner, Jean is frantic because Henry is late. When he eventually arrives, he wants to emigrate immediately, and with good reason: the briefcase he accidentally picked up on the Underground is stuffed with £735,000! When two police inspectors call, Henry, Vic, Betty and a bemused (and tipsy) Jean are forced into a frantic game of cat and mouse. Hilarious innuendo and cruelly funny turns of fate ensue as the two couples assume various identities in their battle to keep the money