Hattie Annis, Nero Wolfe's client in "Counterfeit for Murder," one of the novellas in Homicide Trinity, is a fascinating character. As I mentioned in my review of that book, Hattie Annis narrowly escapes with her life when somebody tries to run her down with a stolen car.
She's lucky. In the original version of the story, Rex Stout actually had allowed Hattie Annis to die under the wheels of that hit-and-run car; by the seventh page of the story, she was out of it. According to John J. McAleer, Stout's biographer, while it was very unusual for Rex Stout to rewrite at all, that first version of the story really was inferior to the final version - largely because of the fascinating character of Hattie Annis. That first version was published after Stout's death as "Assault on a Brownstone," which appeared in the collection Death Times Three, along with McAleer's introduction.
All of which leaves open the question of why Rex Stout chose to rewrite this story. McAleer says he asked the author, but Stout replied, "There must be a reason, but I have forgotten what it was." Most of us who have read both versions are just grateful that he did change it.