Nick and Hank find themselves at the "Iron Hans Ranch," a Wesen-run camp designed to help young men embrace their wild side through a traditional rite of passage. Led by Albert Bowden (Jeff Fahey), the camp teaches boys to hunt rabbits instead of humans—a "modern" take on ancient Wesen instincts.
This episode marks the first time Grimm used the exact title of a Brothers Grimm fairy tale. Grimm season 4 episode 19 review: Iron Hans | Den of Geek
However, a local hitchhiker turns up dead, and the evidence points to a Wesen kill. While the father and son initially seem like the prime suspects, the real predator is the daughter, . Feeling ignored by her father’s focus on the boys, she decides that hunting "the noblest game of all"—man—is the only way to be a "true Wesen". The Folklore: Iron Hans (Iron John)