I cannot find shedebook.org on a google search, do you have a direct link?
Try
this link. As the original publisher was the now defunct Sheed and Ward, the other link was doubtless a misspelling of "sheedbook," but that site no longer exists either.
Nowadays some readers, especially Americans, find Knox's prose difficult to come to grips with—this is merely a statement of fact,
not an evaluation, far less a criticism, of this work or of Knox's style generally. You must decide for yourself, of course.