Ken and Lorna Thompson are proud parents who are looking forward to seeing their daughter, Rachel, again upon her return to England after spending a year abroad. Their joy quickly turns to dismay, though, when she introduces them to her new husband, Cuckoo. As is befitting such a name, Cuckoo is a little too crazy for the elder Thompsons' tastes; he is an American hippie who is full of outlandish New Age ideas. Rachel and Cuckoo live in her parents' house until he heads out to attend university, which should be good news for his in-laws, right? Not so much. After his departure, a mysterious stranger, Dale Ashbrick, appears in their lives, bringing his own brand of craziness.