Entirely silent, with a musical score, sound effects and incoherent mutterings, the story revolves around a weekend gathering at the decaying country home of the eccentric and lewd General Futtock (Ronnie Barker) and the series of saucy mishaps between the staff (Michael Hordern plays the lecherous butler) and his guests.

After a lock-keeper entrusts his daughter to a canal Casanova, he is shocked to learn that she is pregnant. He then refuses to open his locks - causing barges to pile up in every direction until the guilty party confesses.