It's a Potter fic and I think it was on Spacebattles. It's set before the events in the books and possibly before the marauder era.
A British spy agency notices something odd when the child of someone looking for a security clearance has disappeared from the system. They've stumbled across the Wizarding World and go about a subtle low key infiltration.
It's got a scene where the guy in charge is reading a copy of the Quibler for entertainment, and also an agent is recruiting a wizard as a contact by pretending to be a fellow Ravenclaw.
A British spy agency notices something odd when the child of someone looking for a security clearance has disappeared from the system. They've stumbled across the Wizarding World and go about a subtle low key infiltration.
It's got a scene where the guy in charge is reading a copy of the Quibler for entertainment, and also an agent is recruiting a wizard as a contact by pretending to be a fellow Ravenclaw.