The Monster, The Alien, and The Hero

When Sam and Dean find a case in Blackridge Hills, Alabama it seems like a regular routine salt and burn until a strange man in a trench coat and his red haired and hot-headed 'companion' show up and start messing with the case. Also the ghost isn't a ghost at all? It's a shifter, but it can shift without shedding? This story is set in season 3 of SPN and season 4 of DW