Welcome to Skyrim Forums! Register now to participate using the 'Sign Up' button on the right. You may now register with your Facebook or Steam account!
You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
there's supposed to be a mage on the floor right when you enter the place and he babbles about the falmer and dies, he's supposed to have the key on him.
Right opposite the door you're trying to get through is another door. Go back through it and just keep walking the corridor as far as you can go. There is a semi circular chest with the key in. I think you pass it on the way in...I missed it as well.