Too simplistic to be really good
This film seems better than it is because of Joanne Woodward's superb performance, but when you get beyond that it's pretty standard. Not bad; but nothing all that special.
The worst thing about it is how Nunnally Johnson handled the multiple-personality aspect. It's not reducing the number of personalities the actual "Eve" had from over 20 to a more "manageable" three, or pretending things were neatly resolved when in real life they certainly weren't. This is reasonably acceptable for dramatic purposes.
The problem is in treating the audience like a bunch of nincompoops by having the three personalities split into neatly delineated and readily interlocking types: sweet but mousy and timid Eve White; sassy and sexy good-time girl Eve Black; and the safe, normal, well-balanced, middle-of-the-road "Jane" at the end, a combo platter of the best aspects of the other two, without the excesses.
Worse yet, of course, is that the first two are neatly whisked away and conveniently replaced by the sensible center one, and it's all tied up in one neat bundle that leaves the audience feeling everything is happy ever after -- what Lee J. Cobb in the film calls a "solution".
But worst of all is the blatant silliness of calling the women "Black" and "White". Gee, do you think these names signify anything? Could Johnson have made this movie any more basic? I mean, just to make absolutely certain we understood it all?
Oh, yeah, he could. The eerie, mysterious music played when Eve White comes back, vs. the honky-tonk music played when Eve Black shows up. Thanks, Nunnally, now we can really keep track of who's who.
And this film has the audacity to have Alistair Cooke insist at the beginning that every word of this story is true, that it all happened exactly as shown, that the film is not a product of Hollywood fiction. Oh.