In this storyline, the Fisher King lures the team into a "quest" for the Holy Grail by sending them individual clues or physical items.
Spencer Reid is cast as "Sir Percival" and is given the task of asking the question that will "heal" the King. Context for S7E3: " Dorado Falls " [S7E3] The Fisher King
If you specifically meant Season 7, Episode 3, the "piece" of evidence crucial to that case involves: In this storyline, the Fisher King lures the