The two keywords that got me interested are “Blake Edwards” and “James Coburn”. There are quite a lot of WWII farces around by now, and I’m certainly no stranger to them, but a Blake Edwards farce sounds highly promising, and I’ve enjoyed James Coburn in comedies from the time as well.
From what I’ve seen, I’m not sure the title has much to do with how the story is told, unless all of the summaries I’ve read completely ignore a framing device. The unreliable narrator aspect shown on this poster is a good starting point for what I’d want to do with a story with a title like that, but I don’t expect to see it in the movie.
This is being promoted as a romp with a wife who invents a lover to get revenge on her husband for spending more time with his secretary. Apparently it also involves travel to Europe, but I’m not clear how big a part of the movie that is. I suspect the story starts with them relocating for business reasons, and then the new secretary at the new office gets too much of the husband’s attention.
This is based on a play, so I’m expecting some really good dialogue, very long scenes, and a handful of location scenes in Europe because movies feel obligated to Open Up a play.