It started as simple research to find a "cure" for Squibs and it turned into a weapon that stripped the world of its non-magical "blight" in a 6-week flurry of death and devastation. Now, even the remaining witches and wizards aren't safe.
The lingering magic has turned into deadly storms that bring death to anything or anyone magical caught in its grasp. Usually, you can see them coming, but it makes living on your own tough. Only in places under old, heavy magical protections do the survivors have a chance to build a new life in this new and dangerous world.
In the UK, that means either Hogwarts or Malfoy Manor. Which will you choose?