When Mr. Armitage unexpectedly shows up wounded at Dr. Nannetti’s house carrying a newspaper clipping of an accidental shooting at a ranch in Oswego County, NY, he manages to convince the investigators that a pack of werewolves are causing trouble in the little rancher community of Redfield. Frequent disappearances and even more frequent cattle mutilations have caused a lot of tension between ranchers but also between the ranchers and the nearby Mohawk and Iroquois reservation.
The investigators decide to stage a small expedition to Redfield and investigate. After two days of hard driving they finally arrive and find the small community to be friendly and open. When the following day Mr. Simons’ dog Barry is brutally murdered, things take a turn for the worse.
Visiting with Mr. McClain and his son on their ranch, they are invited to spend the night. They accept and are treated to a delicious meal and interesting conversation. At night, the ranch is attacked by two man/wolf hybrids, one of which the investigators manage to kill, but not without Mr. McClain getting lost in the fight and the next day being found decapitated some distance from the ranch.
When the sheriff is called in he treats the investigators as suspects and interrogates them seperately. He concludes that their story doesn’t add up and when Sir O’Reilly gets lippy, he locks him away in the local jail. The sheriff then takes Mr. McClain’s son and heads out to the ranch to do some more research in what happens.
When the investigators are later warned that Mr. McClain’s son is dead, they suspect the sheriff of being dirty and they free Sir O’Reilly from the jail and head out to the ranch only to find the corpse of Mr. McClain’s son and the sheriff inside the ranch shooting at them. They return fire and manage to take the ranch only to be beset by more werewolves at nightfall.
The investigators survive the night, but not without taking heavy damage. They don’t trust anyone in Redfield and decide to grab their things and return to Arkham. Mr. Armitage, not keen on giving up, especially when everyone agrees they haven’t gotten to the bottom of things, decides to stay behind and try to finish up what they started, but the rest is ready to throw in the towel and head home.