Far From Any Road (слэш)

Stiles Stilinski is a young, chronically sleep-deprived detective who's manipulative and morally dubious at best. He's fairly certain that, in the years since he started working for the California Bureau of Investigation, he's seen most of the horrible things that the world could possibly throw at him.
But that's before a body turns up in an alley in Beacon Hills, brutally tortured, with a symbol burned into its back. It's quickly followed by a second and third, and when Stiles is unable to find any hint as to who the culprits might be, his father decides to bring in some outside help.
His name is Derek Hale, and he too has seen some truly horrible things, only some of them on the job.
Stiles hates him immediately. But Derek may be their only hope for solving the case, so Stiles reluctantly agrees to accept his help.
As it turns out, neither of them have seen anything close to the depths of human depravity that await them in the woods and down the back roads surrounding Beacon Hills.