
Portland detective Nick Burkhardt, descended from a long line of warriors known as Grimms, defends his city from magical creatures known as Wesen, which are part human and part animal. Fighting alongside his partner, Hank, colleague Sergeant Wu and friends Monroe and Rosalee, Nick faces off against internal and external forces, including his police captain, Sean Renard.

Portland's Wesen community goes into a frenzy after a brutal vigilante homicide; Capt. Renard offers comfort to Juliette.

Hank remembers an arrest he made earlier in his career when a man claimed he committed murder in self-defense against monsters; Monroe gets involved in an unexpected situation.

Adalind returns to wreak havoc as she avenges her mother's death; Captain Renard's obsession escalates; Monroe receives a surprise visit.

Nick deals with the consequences of learning the truth about Juliette and Captain Renard; Nick must investigate his own crime; Wu responds to a shooting at Nick's house.