Portkey in 20

The BAU is searching for a killer with an odd MO, that leaves bodies that seem perfectly healthy, but they're dead, and what has this got to do with a certain green eyed, black haired, bespectacled young man, with a very strange dress sense?

Authors Note: Hello! I posted this on Fanfiction.net a while ago, and am now posting here. The first six chapters should get posted quickly as they are already written, further chapters will be sporadic, sorry about that.