Harry Granger and the Eye of the Basilisk

The end of Harry Granger's first year at Hogwarts was fraught with danger and injury, but it's nothing compared to this. A monster runs loose in the school, a ghost commands a bathroom, and on top of everything else one of his friends is acting extremely peculiar. But just what is the monster, and what does the villainous Lord Voldemort have to do with things?