A wonderful American debut from Milos Forman, who transcends a rather schematic premise ('wayward' daughter is actually quite sensible, while bourgeois parents enter a counterculture of pot-smoking and (nearly) wife-swapping orgies) with his wise European eye, which mixes clear-eyed observation with fantasy, implausibility and farce. The lead couple are acted in such a low key, you're astonished at the emotional power they generate, and while the subject matter is quite depressing, Forman's comic benevolence is always foregrounded: the convention for parents of missing children, and the accompanying lesson in parental empathy, is an American classic.