While rummaging through their late father's papers, Dean and Sam Winchester are surprised to learn that a little brother has been kept from them. The latter, who is totally unaware that he descends from a line of hunters, lives in the small town of Beacon Hills, California, under the name Stiles Stillinski. But just when the two Winchester's decide to go meet the youngest of the family, Stiles disappears in mysterious and inexplicable conditions. Driven by an incomprehensible instinct to protect this teenager they have never met, the two young men are going to sink into a world even more charming than the one on which they grew up.