On Grimm Season 4 Episode 21, Nick is horrified at how completely he's lost Juliette. Things get even worse when he calls Renard to warn him about Juliette... only to get Jack the Ripper on the other end of the phone call. When Nick and the others rush to Renard's house, they find him alone and safe, with just raises more questions. Could Renard himself be Portland's Jack? How is this even possible? The situation only grows more dire, and Sgt. Wu himself is in danger. Meanwhile, Prince Kenneth's plan to lure Kelly Burkhardt - and thus the Royal child Diana - into the open comes to fruition as they stake out Nick's house and lay a trap for the unsuspecting Grimm. Will Kenneth succeed in his dastardly plot? How far will Juliette go to lash out at Nick, the man she once loved with all her heart? How will Nick and his friends stop Jack before he kills again? If Renard is somehow possessed by the spirit of Jack, how do they get rid of it without killing Renard himself? Find out the answers to these questions and more when you watch Grimm Season 4 Episode 21 online, right here at TV Fanatic!