Nick and Hank's investigation of a dead high school teacher leads them to the school's outcast, Roddy. Nick realizes that there's more to Roddy than meets the eye, and enlists Monroe's help to get through to the troubled teenager before he exacts revenge on the students who wronged him. Meanwhile, Nick learns that his presence is beginning to affect the creature world.

Nick finally discovers that Hank is dating Adalind, the same Hexenbiest responsible for Marie's death. Meanwhile, Monroe and his girlfriend Rosalee have to secretly help Hank and Wu, and Renard gets a visit that threatens his position among the creature leadership.

As Hank continues to seek help to cope with the inexplicable siting he had, an old friend, Jarold Kempfer, needs his help when his daughter goes missing. Nick’s expertise as a Grimm comes in to play as he investigates the disturbing motives linked to the disappearance.

The Resistance's plan to keep Adalind safe gets kicked into high gear when an unexpected ally arrives to ensure she and the baby make it out of Europe safely. In Portland, as Monroe and Rosalee prepare for their upcoming wedding, Nick and Juliette are reminded of their failed proposal.

Nick and Hank are called to the scene when three Wesen go out on a hunt at a local dump and get more than they bargained for when two turn up dead after they encounter the mythical Rat King. Meanwhile, a very badly wounded Trubel is taken to the hospital and Nick finally meets Meisner.