Nick, Hank, and Wu are called to investigate a series of frozen corpses and discover a rare Wesen that steals the body heat of its victims.
Called a Varme Tyv (meaning "heat thief") these poikilotherms (cold-blooded like amphibians and lizards) need to hibernate, en masse, to survive even moderate temperatures, or they too, freeze to death.
Elsewhere, Captain Renard continues to suffer from frightening visions and mysterious bleeding, while Monroe works toward coming to grips with the Wesenrein incident.
)"[4] Kathleen Wiedel from TV Fanatic, gave a 3.8 star rating out of 5, stating: "I have to admit, I got a good amount of guilty pleasure when Adalind realized that Juliette was hunting her.
"[6] Christine Horton of Den of Geek wrote, "On reflection, Hibernaculum could be classed as one of the stranger episodes, even for a show based on fairytales.