I have just 700 words to go, to complete the basic task, and that doesn't seem much for tying up the loose ends, but it will do. Not that you have to stop at 50K, if you need more to make it elegant.
Like an abrupt Hitchcock ending, though (think Vertigo, or North by North-West) the story is done, the baddies are dead, the valuable MacGuffin is identified and safe, and all is right with the world. So I might as well stop.
Will take a quick break, as I come into the home stretch, and then come back to wrap it up.