From the introduction:
The world of magic exists behind the scenes. Or from the perspective of wizards, they’ve carefully tucked away the mundane world to protect themselves. But this isolation isn’t easy. Separation doesn’t come only via distance, fae glamours, or cute enchantments. It relies on a large and complex bureaucracy, a regulating institution safeguarding both sides from one another, though without the permission of those lacking magical talent. This institution is called The Authority of Sorcerous Affairs, otherwise called The Authority, and it has many arms, many branches, many agents.