[s7e3] The | Fisher King

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 "

If you specifically meant Season 7, Episode 3, the "piece" of evidence crucial to that case involves: [S7E3] The Fisher King

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

The "piece" for the puzzle was a section of a large map or picture that, when assembled, revealed the location of his "Grail"—his daughter, Rebecca. [S7E3] The Fisher King

Each team member receives a personal item or message while on vacation that leads them back to Virginia.