User blog comment:Roacher26/Hirtenkühe/@comment-4563264-20120415032955

Boom. I got it. There's this farmer dude (the Wesen) who keeps having his cattle stolen/killed. Eventually, he sends a farmhand outside to guard them. The farmhand is killed by the unknown person. The detectives show up, blah blah blah. They search, find clues, et cetera et cetera. Eventually, Nick discovers a Schakal/Blutbad/Pixie-creature (see Beastly 14's "Cool Ways to portray Grimm Creatures") /Other, and... yeah. The person is arrested.

PS: There's another option I will write. The Black Cow one. Gimme a sec (might take longer than a second).