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After the mysterious brutal attack of a local college co-ed, Portland homicide Detective Nick Burkhardt discovers he is descended from an elite line of criminal profilers known as "Grimms", charged with keeping balance between humanity and the mythological creatures of the world. As he tries to hide the dangers of his new found calling from his fiancée, Juliette Silverton and his partner, Hank Griffin, he becomes ever more entrenched in the ancient rivalries and alliances of the Grimm world. With help from his reluctant confidant, Monroe, a reformed Grimm creature himself, Nick must navigate through the forces of a larger-than-life mythology.
After a case of breaking and entering has one of the intruders go missing, Nick and Hank talk to a mysterious family whose cultural background blurs the line of right and wrong. The family is, in actuality, a family of bears who engage in a ceremonious right of passage in which they hunt humans—in this case, the two intruders. Nick convinces the father to help find the boys and save the family's prey. Meanwhile, Nick tasks Monroe with the safeguarding Aunt Marie, who was almost killed the night prior by a hexenbiest. Monroe stops two people in the boiler room who were sent to kill Marie, but goes overboard and rips off one of arms of the attackers. As Monroe calls Nick to tell him, a Reaper assassin dressed as a priest attempts to kill Marie, only to be killed by her. Marie's last breath is used to tell Nick to find the bad ones and stop them. Nick moves the trailer, which holds all Grimm secrets, and grieves for Marie's passing as he begins his hunt.
The station is abuzz as Nick and Hank are called to a case where an innocent flash mob results in a gruesome homicide. As Nick delves further into the investigation, he learns more about his unique family history, and finds himself at odds when he and Hank are assigned to protect a dark character from his recent past.
After investigating a strange cluster of female deaths and disappearances, Nick sends Monroe undercover to get a whiff of a hypnotic suspect. In the meantime, a stranger shows up looking to avenge the death of his friend at the hands of a Grimm, but he'll have to get past Captain Renard.
Nick and Hank's investigation of a dead high school teacher leads them to the school's outcast, Roddy. Nick realizes that there's more to Roddy than meets the eye, and enlists Monroe's help to get through to the troubled teenager before he exacts revenge on the students who wronged him. Meanwhile, Nick learns that his presence is beginning to affect the creature world.
Nick is called to a suspected arson case, which exposes a longstanding family feud that brings Monroe face-to-face with characters from his troubled past. While Monroe wrestles with restraining his wild side, it's up to Nick to keep everything from going up in flames.
A mysterious homicide deep in the woods leads to Nick and Hank reopening a long-cold missing persons case. When Nick suspects this abducted person might be a feral creature, he asks Monroe to help remind this wild child of her human nature.
An escapee returns to Portland seeking revenge against those who put him behind bars, including Hank, the arresting officer. His unusual strength and high tolerance for pain makes Nick suspicious that he might be more than human. As the case escalates Nick and Juliette are put in danger, and Monroe is called into action to help put an end to the convict's deadly rampage.
Nick and Hank investigate a murder victim left in a dumpster, and soon discover that the trail leads to an abusive boyfriend, an arrogant lawyer, and a meek junk yard owner. Meanwhile, Juliette notices someone watching her and Nick, and Eddie gets a message from the creature community.
After some of Portland's homeless youth go missing, Nick discovers a black market supplying the Grimm world with human organs. As the investigation continues, Nick and Juliette befriend a pair of homeless siblings, Hanson and Gracie, whose friends have gone missing.
Nick and Hank search for a dangerous heartbreaker who leaves behind a gruesome corpse and apparently her finger. Nick and Juliette's safety is threatened when the creature world begins to discover his identity.
A homicide investigation leads Nick and Hank to a boxing gym and they discover that the joint’s really the supply source for a ritualistic band of brawlers. But since rule No. 2 of this particular fight club (a.k.a The Lowen Games) is “Leave the human out of it,” they enlist the help of Monroe, who in no time at all is trapped with a creepy cage neighbor.
A failed robbery leads Nick and Hank to powerful rare coins. Meanwhile, a suspect in the case may have information regarding the death of Nick's parents.
Nick finds himself in the heated world of Portland fire dancing where he meets a woman who might just be too hot to handle.
After the grisly murder of a familiar shop owner, Nick joins forces with Monroe to help solve the murder. When the shop owner’s sister, Rosalee, comes to town, Nick thinks he may have found a new ally in the creature world. Elsewhere, Captain Renard enlists Adalind to cast a spell on Hank. Meanwhile, Sgt. Wu unwittingly becomes entangled in Adalind’s dastardly plan.
Nick pulls out all the stops to plan a romantic getaway for Juliette in an attempt to get their relationship back on track. Nick’s duties as a Grimm get in the way of romance when he meets the unsettling neighbors and discovers that the troubled wife has a rare and valuable treasure to protect. It’s left to Nick to keep everyone safe. Back in Portland, Hank and Monroe each find themselves on the brink of new romantic relationships.
Nick and Juliette join Hank for dinner, where Nick discovers Hank’s mystery date is none other than Adalind, the same Hexenbiest who tried to kill Aunt Marie. Meanwhile, Captain Renard takes matters into his own hands when a visit from foreign representatives of his royal bloodline threatens his position. Elsewhere, Monroe and Rosalee are called into action when the lives of Hank and Sgt. Wu hang in the balance.
Nick and Hank find a murder crime trail backtracks abroad; when Nick finds Monroe and Rosalee are harboring the prime suspect, an apparent conflict arises between police duties and his inner Grimm.
As Nick delves into the trailer's weapons cabinet and his inner Grimm, the investigation of a dead construction worker leads him into a long-standing conflict in the creature world.
Nick and Hank are called to investigate the mysterious death of a wealthy matriarch, after her stepdaughter loses everything in a Ponzi scheme. Meanwhile, Juliette does some digging into the mysterious death of Nick’s parents in an effort to help him find closure.
When Juliette stumbles upon a horrifying murder, Nick learns the suspected creature is unable to return to a human form; Hank sees something inexplicable.
As Nick delves deeper into his life as a Grimm, a trail of grotesque murders reignites the search for the elusive gold coins.