On Halloween 1981, Britain's Dark Lord was defeated by the Boy-Who-Lived, and the next day, Sirius Black killed Peter Pettigrew and twelve Muggles - well, actually eleven Muggles and an American wizard - in a Southampton neighborhood. Therefore, the Magical Council of the United States sent a newly appointed Auror to investigate.
At present, this Auror's name is unremarkable in the American wizarding world, but it is a different matter in non-magical fields. Her name is Deese Wayne—yes, the Wayne you think of.
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Note:
Original daughter, Bruce's twin sister
The main line is in HP, but there are some Batman Year One and 80s animated-flavored Bateman and Robins.
Not having read DC/Batman does not affect your reading (it should, because the DC universe is a mess.)
In fact, I don't write detective-style (lying down) pure stream-of-consciousness idealistic reasoning.
But compared to some criminal investigation methods that were still used by the Ministry of Magic in the Middle Ages (pointing and pointing)
Dis Wayne x Sirius Black
Intention: Justice and courage will lead a smooth journey