Help Needed!

The Topic: The Mysterious Phone Call Quest.
I know I've done this before, but a couple of my friends were stuck at some point in the quest, you know, when you found all three clues, what do you do next? If you talk to Kameria, she says something about sleeping last night and looking out for more cookie crumbs. But, as far as I know, there is no fourth clue. So can someone help us? That would be great...