Phoenix

Corrected entry: At the end of the movie when Amy visits Mort, the cabin walls all have "Shooter - Kill Her" etched into the wood. But when the sheriff shows up, the carvings are gone.

Corrected entry: The setup that Mort has to wait for the magazine to appear in order to prove to "Shooter" that he really did write the story, has several holes. 1)Most obviously, we see that Mort has several copies of all of his books at the country house. A quick look at the first page of the relevant book would have shown which magazine or outlet originally published the story, as is required by copyright law. So all Mort would've had to do is open that page and show "Shooter" something that would have read "This story originally appeared in Ellery Queen, such and such year, etc etc." 2) Barring that, all it would've taken is a quick phone call to the magazine itself and they could've over nighted a copy of that story. Even if we accept what we later find out about Mort and Shooter, there are still way too many unexplored options to make this plausible.