"Grimm" is a drama series inspired by the classic Grimm Brothers' Fairy Tales. After Portland homicide detective Nick Burkhardt (David Giuntoli) discovers he's descended from an elite line of criminal profilers known as "Grimms," he increasingly finds his responsibilities as a detective at odds with his new responsibilities as a Grimm.
In the wake of Monroe (Silas Weir Mitchell) and Rosalee's (Bree Turner) wedding, things have never been more chaotic. Nick, having lost his Grimm abilities, must dig deep and decide what type of person he wants to be, while Juliette (Bitsie Tulloch) continues to try to come to grips with Nick's recent "betrayal." Monroe and Rosalee find themselves having to put their honeymoon plans on hold to try to not only figure out what happened to Nick, but also how to reverse it.
With Captain Renard (Sasha Roiz) in critical condition after being shot by Agent Steward, Sergeant Wu's (Reggie Lee) biggest fears are becoming reality thanks to recent events, not the least of which is the strange young woman seen with Nick and the sketches he saw in one of her books.
In Europe, Viktor (guest star Alexis Denisof) is trying to make the best of the Royals' mishandling of the "Hexenbaby," using Adalind's (Claire Coffee) desperation and vulnerability to make her his prisoner.
On top of all this, Wesen crime in Portland doesn't seem to be letting up at all, with even more dangerous Wesen making their way to the great northwest. It's going to take all of Team Grimm's strength and energy to keep Portland from bursting open at the seams.
In the premiere episode of Season 4, Thanks for the Memories, Nick adjusts to the loss of his powers. Meanwhile, a group of Wesen come to Portland and steal people's memories; Renard fights for his life; and Adalind's desperation lands her in Prince Viktor's clutches.