Mistress of the Stacks

An archaic danger is rampaging through the Hogwarts Library, and it's up to Headmaster Snape and Mistress Granger to solve the mystery in the stacks. But can they overcome their contentious history to fix the problem, or is history doomed to repeat itself? An expanded version written for Irishredlass as a part of the 2014 LJ SSHG Giftfest. Rated M for violence & adult situations.