The Inspector of Hogwarts

AU. It's fifth year, and with the OWLS looming ever closer, Harry and his fifth year peers are dedicated to passing their OWLS. With Remus Lupin as their professor, they all expect to pass DADA with flying colors. But when Inspector Umbridge, a ministry goon threatens that, the students and staff go to great lengths to protect the best DADA professor they've ever had.