Saoirse Scamander and the Philosopher's Stone

Harry Potter is coming to Hogwarts, but also coming to Hogwarts is Saoirse Scamander, Deputy Headmistress of Ilvermorny, Hogwart's sister school and now a Professor at Hogwarts. What lurks the halls of Hogwarts besides ghosts and what exactly is hidden on the third floor? Can Saoirse rise to the challenge or will she be defeated by Dark forces at work.