From 11:00PM PDT on Friday, July 1 until 5:00AM PDT on Saturday, July 2, the Shmoop engineering elves will be making tweaks and improvements to the site. That means Shmoop will be unavailable for use during that time. Thanks for your patience!
Mrs. Norris is Filch the caretaker's creepy cat. The students regard her with dread and disdain. Harry wonders, for example, if she can see through his invisibility cloak when he's trying to travel through the castle secretly. Her name reminds us of the overbearing aunt Mrs. Norris in Jane Austen's Mansfield Park.