It had been her birthday, she remembered now. But now, horror creeping over her like a lengthening shadow, she realised she had no memory of coming back here. How had she gotten from the Room of Requirement back to her quarters? Had anyone seen her? Surely she must have made a ruckus, stumbling and tripping her way back to the dungeons, there must have been Prefects and professors on patrol. And then, of course, Severus would have given her a tongue-lashing when she came home, but...she had no memory of it. It was simply gone.