Ep 15. Mr. Sandman

Nick and Monroe team up to solve a case involving a Sandman Wesen, who is putting people to sleep and inducing nightmares, leading to their death. The Sandman, who is also known as The Dream Killer, seems to be targeting people who have recently undergone a traumatic event or have a guilty conscience, making them vulnerable to his powers.

As Nick and Monroe investigate the case, they discover that the Sandman is not acting alone. He has a partner who is gathering information on their victims and passing it on to the Sandman. They also learn that the Sandman's abilities are not only limited to inducing sleep and nightmares, but he can also control his victim's dreams and extract information from them.

Meanwhile, Juliette continues to struggle with her memory loss and is frustrated with Nick's reluctance to share the truth about their past. She takes matters into her own hands and seeks out a hypnotist to help her recover her memories.

As the investigation into the Sandman intensifies, Nick and Monroe realize that they will need to use unconventional tactics to catch him and his accomplice. With the help of a special Wesen potion, they enter the dream world of the Sandman and his victim to gather evidence and stop him before he can claim more lives.

In the end, Nick and Monroe are successful in apprehending the Sandman and his partner, but not without some close calls and unexpected twists. Juliette also makes progress in recovering her memories, but realizes that the truth about Nick and his life as a Grimm is even more complicated than she originally thought.

Overall, "Mr. Sandman" is an intense and thrilling episode that showcases the unique Wesen powers and the creative ways in which Nick and Monroe use their Grimm skills to catch the bad guys. It also provides insight into the complex relationships and secrets that continue to drive the characters.