The cursed coins resurface after someone else starts killing to obtain them. Meanwhile, Nick and Hank find a mysterious woman interfering in their case, and Nick and Juliette must make a life-changing decision.
Nick becomes involved when Juliette witnesses a murder committed by a creature who is unable to maintain his human form. Meanwhile, Hank begins to notice a few things that don't add up.
Nick and Hank investigate the death of a wealthy widow and finds that the trail leads to her stepdaughter Lucinda and her mysterious godfather, Spencer Harrison. Meanwhile, Juliette tries to help Nick deal with what she believes is the death of his aunt.
When Nick investigates the death of a construction company owner, he discovers that the suspect has summoned the Reapers to town to dispose of him. Meanwhile, Juliette makes Nick invite Eddie over for dinner.
Eddie and Rosalee harbor an overseas visitor and murder suspect... and Nick finds out about it.
Nick finally discovers that Hank is dating Adalind... the hexenbiest responsible for Marie's death. Meanwhile, Eddie and his girlfriend Rosalee have to secretly help Hank and Wu, and Renard gets a visit that threatens his position among the creature leadership.
Nick tries to take Juliette on a romantic weekend but soon becomes embroiled in a case involving a neighbor couple. Meanwhile, Eddie and Hank both find themselves romantically involved with new women.
Nick looks into a theft and murder at a spice shop and discovers that it was owned by a wesen, and that the thieves were after a dangerous drug. Meanwhile, Hank falls under Adalind's sway and Wu gets caught in the middle.
Nick investigates a fire-dancer who may be the woman responsible for a fire-related homicide.
While Nick and Hank look for rare coins that were the target of an robbery that ended in homicide, a friend of Aunt Marie's arrives with information for Nick about his family.
An underground fight club where monsters participate in blood battles is tied to a murder that Nick and Hank are investigating.
While tracking down a creature with a taste for heartbreaking, Nick discovers that he and Juliette may be in danger as word of his reputation as a Grimm spreads.
Nick investigates a black market organ-harvesting ring that caters to the supernatural creatures of Portland.
While Nick investigates a creature that may have start killing due to its abused childhood, the creature community begin to have doubts about Monroe's loyalties.
A prison escapee returns to Portland and seeks revenge on everyone who got him arrested. Nick notices his unusual strength and high tolerance of pain and calls Eddie to help put his rampage to an end.
Nick and Hank investigate a murder in the forest which is connected to a missing-person case, and Nick has to ask Eddie for help when it turns out the missing person is a feral creature.
A fire reveals a longstanding family feud and brings Munroe face-to-face with his past. Meanwhile, Nick has to keep everything from going up in flames.
Hank and Nick check out the death of a teacher and discover that one of his students is involved: Nick discovers that the presence of a new Grimm is having repercussions on the creature community.
After a strange group of female deaths and disappearances, Nick sends Monroe undercover to spy on a hypnotic suspect. Meanwhile, a stranger shows up in Portland and tries to get revenge on Nick for the death of a reaper, but he'll have to get past Captain Renard.
Nick and Hank investigate a flash mob incident that resulted in a bizarre homicide involving bee venom. While working the case, Nick ends up having to protect the hexenbiest that tried to kill him and his aunt at the hospital.
A barbaric family history is revealed when Nick and Hank investigate a case of breaking and entering. Meanwhile, Nick assigns Monroe to look after Aunt Marie.
Nick Burkhardt's life is completely transformed when his family's legacy is revealed to him and he discovers that he is a Grimm, a monster hunter who can see the creatures for what they really are.