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Recap / Grimm S 4 E 20 You Dont Know Jack

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Jack's back.

Catch me when you can.

Nick and Hank investigate the murders of Wesen prostitute in a manner resembling those committed by Jack the Ripper. The investigation becomes more complicated when books recovered from the trailer reveal that Jack's crimes may go back further than suspected.

Adalind helps Monroe and Rosalee make a potion to cure Juliette, requiring her to first dig up her mother's corpse. However, Juliette teams up with prince Kenneth, obsessed with revenge on Adalind.


This episode provides examples of:

  • All for Nothing:
    • The potion the gang and Adalind make to suppress Juliette's Hexenbiest nature. She smashes the bottle, flat-out refusing to take it.
    • Adalind tests the potion on herself, presumably rendering all her previous efforts to regain her powers moot.
  • Ask a Stupid Question...: When Adalind tests out the Hexenbiest Suppression potion, which was made using Catherine Schade's body, someone asks how she feels.
    Adalind: Like I just drank my mother.
  • Cliffhanger: Juliette refuses to take the potion and turns on the gang, throwing Rosalee across the room. Nick pulls his gun, only for Juliette to telekinetically force him to aim the gun at Monroe. Fade to Black as a shot is heard.
  • Disposable Sex Worker: The first two victims are Wesen prostitutes. The third victim is Henrietta, who wasn't a prostitute but had information on Jack.
  • Foreshadowing: Henrietta is murdered by Jack the Ripper right after Renard goes to her with his Sanity Slippage problem. This foreshadows that Renard is the one being possessed by Jack.
  • Historical Domain Character: The Monster of the Week is Jack the Ripper, who's possessing someone to go on a killing spree. The opening quote is from a taunting letter Jack the Ripper sent to the police in 1888.
  • She Knows Too Much: Henrietta is killed by Jack just as she realises what's happening.
  • Wham Shot: The burned-out trailer. Lingering shots of the damage are shown as Nick, Hank, Monroe and Wu go in to save what they can, each of them experiencing Flashbacks to times they've spent in there as they look around in devastation. It's as if a main character has been killed.
  • You Wake Up In A Swimming Pool: Renard finds himself floating facedown in someone's pool right after the first murder.

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