You count yourself lucky that Dumbledore's password has not been changed since the last time McGonagall brought you here, but your victory is short lived as the Office is very much empty. Even in panic you still have to admire the elegance of this room, everywhere you look there's magic!
Only Fawkes is perched nearby, you give him a hurried pet and whisper 'Make sure he sees this when he's back, okay?', and you leave a note on Dumbledore's desk
I have gone to try and save Ginny, I believe the entrance to the Chamber of Secrets is in the Moaning Myrtle's bathroom, please send help as soon as possible - Harry'
You better be right about Myrtle's bathroom, it has clicked in place whilst running up the stairs. The legend says that there was a death, a young girl has died a horrible death by the very monster that haunts the Chamber of Secrets, and she never truly left the castle. What if they mean that the girl still haunts the place? The only young ghost you know is Moaning Myrtle. It's a long shot, but it's the only one you've got!