Riddle, the author of a book Harry discovers, is in fact Voldemort.
students keep getting 'petrified' - made into living statues - and
Harry keeps hearing voices that nobody else does. (This is because
Harry can converse with snakes - a snake travels through the drainage
system, attacking the students).
Lockhart, played with bouffant brilliance by Kenneth Branagh, is
the glamorous, but not very magical, teacher of the Defense against
the Dark Arts... He's not much use to anyone...
manages to get Dumbledore and Hagrid off the scene so that Harry
can be destroyed. However, at crunch time, Harry's devotion to Dumbledore
saves the day, calling Dumbledore's magical phoenix to the rescue.
all live happily until the next book.