An interesting film that still looks good after almost half a century. It's the kind of adult entertainment that demands thinking on the part of the audience. The story is the usual Marguerite Duras bubbameister masquerading as an incisive analysis of a troubled marriage. The film runs only 85 minutes; any longer and it would wear out its welcome. Beautifully photographed in a small Spanish town and countryside, with some exciting glimpses of Madrid toward the end, it's a triumph of visual style. The three principal actors (Melina Mercouri, Peter Finch, Romy Schneider) all look great, especially Mercouri, who at 45 never looked better. Husband director Jules Dassin here captured her at her peak. Peter Finch for a time just about cornered the market on these adult dramas ("The Pumpkin Eater," "In the Cool of the Day," "I Thank a Fool," "Sunday Bloody Sunday"). Plus, this trio can act, which makes all the pointless posturing and dialog seem more important than it is. I particularly like the enigmatic ending (shades of Antonioni's "L'Avventura"). "10:30 PM Summer" has enough merits to warrant seeking out this seldom-seen curiosity.