three bits of press:
Scene (item 3), Cool Cleveland (under "Events") and Free Times (not online) page 22 item 2.
Also, here's a small collection of "The Passion of Joan of Arc" links that describe the plot in far better detail than I could ;)
This review is probably the most comprehensive, while this review is a close second. There's a review from the BBC, as well as a comprehensive listing of all the films from Carl Theodor Dreyer (including the excellent, but non-silent "Vampyr")