Limit Authors to Create and Edit Only One Post

For a specific reason, I need to limit the number of posts an author can create AND edit to only one. It will be “their one and only post”, but they’ll need to be able to update, as needed. Is this possible? The post-limiting plugins I’ve tried only let a single post be created, but they don’t allow the author to edit the post, once it’s published.

Thank you,
Ed