Harry Potter could find trouble in paradise and when Draco sends him to St Louis for a holiday it's not paradise and there's lots of trouble. With dark magic, vampires, lycanthropes and more, who else could sort it out but Anita Blake?

The Best Defense and its sequels are an epic Harry Potter/Yu Yu Hakusho crossover, AU for 5th-7th years in the HP universe.

It starts like this: Well, okay, Patrick has no idea how it actually starts. But as pertains to him (in other words, the important part), it goes a little something like so: America, being a nation composed in large part of a melting pot of immigrants who may or may not have taken over land already owned by others using less-than-savory means, doesn’t have much of a magical national identity. Much less a magical continental identity. There’s no grand heritage going back thousands of years. Magical families home-schooled all their kids until, like, the 1800’s, and tough for the muggle-born, apparently. Hopefully you got noticed by someone who knew what to do with you before you got burned at the stake. Since you probably can’t control your powers, sport.