Ep 1. The Ungrateful Dead

Nick, Juliette, and Hank are trying to figure out how to deal with the aftermath of Captain Renard's near-fatal shooting. Nick is struggling with his newfound powers and losing control, while Juliette is worried about his safety. Meanwhile, Monroe and Rosalee are dealing with their own problems as they prepare for their wedding. However, they are interrupted by the arrival of a mysterious woman with a deadly agenda.

The case of the week revolves around a woman who dies in a car accident, only to come back as a vengeful ghost seeking revenge on those who wronged her in life. Nick and Hank discover that the woman was a member of a cult that believed in the power of the dead to exact revenge on the living. As they investigate further, Nick begins to suspect that there may be a Wesen involved in the case.

Meanwhile, Monroe and Rosalee are trying to enjoy their pre-wedding festivities, but their plans are derailed when Monroe's mother unexpectedly shows up. Monroe's mother disapproves of his relationship with Rosalee and tries to sabotage their wedding plans. Monroe and Rosalee are forced to confront their differences and figure out if they are truly ready to take the next step in their relationship.

As Nick and Hank work to solve the case, they are confronted by the vengeful spirit, who has set her sights on Nick. Nick must use his Grimm powers to defeat the ghost and put her to rest. Meanwhile, Juliette and Renard's relationship takes a surprising turn as Juliette seeks to understand Nick's world and her own place in it.

Overall, Grimm season 3 episode 1 is an exciting and suspenseful start to the season, with a good balance of supernatural action and character development. The case of the week is interesting and the addition of Monroe's family drama adds some humor and heart to the episode. Fans of the show will definitely want to tune in and see where the story goes from here.