On the upcoming episode of Grimm season 4 entitled  "You don't know Jack" Nick finds both of his personal and professional life in a dire situation. The episode scheduled to air on May 1 (Friday) is expected to unfold new series of events.

 On the previous episode Adalind drops the bomb to Nick that indeed he's a soon to be father and that she needs protection from his girlfriend Juliette who wasn't so happy so when she heard the news. Meanwhile after a series of murders speculation whether a Jack Ripper wannabe had reached Portland.

Juliet who was revealed to be a hexenbiest is starting to use her supernatural powers to destroy things and even hurt people around her especially after learning of her mortal enemy, Adalind's pregnancy, bad started to become worse especially after she started to team up with Kenneth.

Adalind on the other hand is out to convince Nick that she can help Juliette and bring back her old self by digging out her mother's grave. 

On the other hand, series of murder is starting to get even worse with the Wensen killer killing it's victim like an animal, Nick and his team started to hunt the killer but was surprised when he finds out that the killer is no other than her former lover now angry hexenbeist, Juliette.

 Will Nick be able to set aside his feelings towards his ex lover and held her accountable for her doings? Will Juliette be cured and go back to her old self or will she become the person she used to despise the most? More importantly does she want to back to her old self?

As the popular saying goes with every ending comes another beginning and this episode 20 of the of is just what every fans of Grimm needs a conclusion to the previous incidents and springboard to the remaining four episodes.