A case of breaking and entering introduces Nick and Hank to a mysterious family whose cultural background blurs the line of right and wrong. Meanwhile, Nick tasks Monroe with safeguarding Aunt Marie.

Nick learns that a series of disappearances, rapes-and possibly murders-of beautiful women in the Portland area is connected to a honeymoon hotel where the owner harbors a hypnotic power.

Nick investigates the death of a music teacher who was eaten alive by rats whille locked in his own car. Nick and Hank are led to a expelled music prodigy who has a strange sort for vengeance against those who wronged him.

When a hiking couple is saved from a drug trafficker from what appears to be a "Feral Beast" nick investigation into it leads to the suspicious that it is linked with a 10-year old missing persons case.

While investigating the death of a homeless teen, Nick and Hank uncover a ring of Geiers harvesting human organs. Also, the Verrat threaten Captain Renard to keep the Grimm under control.

Nick and the police department goes on the hunt for a mysterious wesen woman who first seduces men and then gruesomely murders them in a "Arachnid"-related death.

When heavily burned bodies appear, Nick learns of the existence of dragons in the world of wesen and a charismatic fire-dancer tries to spark a flame between herself and Nick, hiding a deadly true agenda.

Nick investigates the robbery of a spice shop, that is owned by wesen, discovering that the thieves were after a dangerous drug.

Nick and Juliette go away for a little R & R. They meet a couple who turns out to be not human. Juliette meets the wife and senses she's being abused. Nick learns the man is a being who abuses women.

Nick searches for the potential witness to the murder of a bridge construction contractor caused by a troll-like wesen.