The Secret of Skyhold Tower

From the introduction: For over a hundred years, Skyhold Tower has floated harmlessly above the lands of Faerun. But now it is plumeting toward the earth - directly at Neverwinter! Our heroes have been urgently recruited to enter the tower and avert disaster - but can they uncover the shocking secret of Skyhold Tower before it's too late? User summary: For 5th - 7th level characters.