Nick and Hank are called to investigate a double murder, and quickly learn that the victims were from a special section of the Verrat tasked with finding rare objects related to the Wesen.
Nick and Hank investigate a series of strange home invasions. Monroe has a Christmas surprise for Rosalee.
The latest attack against Rosalee and Monroe makes Nick want to become a Grimm again more than ever. A group of Wesen use a stretch of highway for a horrific ritual.
A woman claims a persistent talking wolf drove her to madness. Juliette and Nick weigh the potential costs of getting back his powers and threats against Monroe and Rosalee's marriage intensify.
Jane finds herself in immediate danger when the kidnapper's identity is discovered; Bird's investigation connects him to new evidence that leads to a shocking confrontation; Ali reveals a secret to Pete; Tom has to make a choice.