Nocturne is a taut chamber drama, set in a musty suburban estate to which a pretty but drab-looking woman (Lisa Eichhorn) returns upon the death of her mother (Maureen O’Brien), who in flashback we discover was a fiercely proper and dominating woman. Eichhorn’s depressed reveries are abruptly interrupted with the unexpected arrival of a pair of hitchhikers, amoral, free-spirited young lesbian lovers (Caroline Paterson, Karen Jones) seeking shelter from the rain.