Maggie feels superfluous when the children all go to Andrew with their problems. So she decides to leave home.

Maggie becomes a cub mistress and Andrew has a reunion lunch withhisformer secretary. But when Rosie tries to arrange forthe Prentices to win a car in the raffle, Maggie faces a moral dilemma.

When the Prentices take a family holiday on a narrow boat, Andrew draws up a duty rota. As his only "duty" appears to be acting as captain, it is not long before the crew are plotting mutiny.