The file you are referring to, , is the 17th episode of the first season of the supernatural police procedural series Grimm , titled "Love Sick" . Episode Overview

: Nick confronts Adalind in the woods. During their struggle, he forces her to ingest his blood. This acts as a "death" to her Hexenbiest spirit, stripping her of all supernatural powers and leaving her a normal human.

: By the end of the episode, Nick uses the key as a stamp with ink, revealing that it forms part of a much larger map. Guest Stars & Production Bree Turner as Rosalee Calvert. Claire Coffee as Adalind Schade. Jessica Tuck as Catherine Schade (Adalind's mother).

: A side plot reveals more about Captain Sean Renard’s origins. He is forced to deal with "representatives" from his royal bloodline who threaten his position in Portland.