From the moment their vacation plans are first discussed Mr. Hobbs evinces misgivings about trekking off to an unfamiliar island on the New England coast, but the combined enthusiasm of wife Peggy and daughter Kate soon overwhelm his feeble opposition. Away they go to Rock Harbor, but they have no sooner reached their destination, crumpled and road-weary, than Mr. Hobbs' direct predictions begin to come true. Their house is an uncomfortable horror and its plumbing, as Mr. Hobbs quickly finds out, is a nightmare. The hope of having a good rest is further annihilated when daughter Jane and son-in-law Byron appear on the scene.