Grimm season four, episode 13, "Trial by Fire," centers on an Excandesco Wesen committing arson, forcing Nick to use Peter Orson to help the investigation. The episode is defined by the confrontation between Adalind and Juliette and Juliette’s revelation of her Hexenbiest nature to Nick. For a full review, visit Den of Geek .
Grimm season 4 episode 13 review: Trial By Fire | Den of Geek Grimm_4x13