Not dissimilar in themes to the various A Star is Born instances we've been watching, in that it's partly about fame and performance.

A successful stage actor is not-quite-stalked by a fan, the titular Eve, who then becomes her personal assistant, and gradually moves almost to replace her.

Which makes Eve sounds more sinister than she comes across in the film.

And despite the title, it's really more about Margo than it is about Eve.