Complete story — includes the ending
Monroe has a unique Christmas surprise for Rosalee. Trubel and Josh work together to track down the Wesenrein with gleichheit (equality) masks who keep threatening against Monroe and Rosalee's mischehen (mixed marriage). Meanwhile, Nick and Hank investigate a series of strange home invasions and uncover a bizarre Wesen phenomenon called kallikantzaroi (malevolent goblins-like wesen), with a rare genetic disease disorder during adolescence that wreaks havoc on Christmas unless they eat fruitcake until sunrise. Then the children of Indole Gentile (deer-like wesen) are back to normal. Opening quote: "I have but to swallow this, and be for the rest of my days persecuted by a legion of goblins, all of my own creation. Humbug, I'll tell you; humbug!"
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Grimm season 4. HTML formatting and reference markers removed. · Content license