Watson:
Holmes, I’m convinced—that must be where the treasure of Hyotanjima is!
The clues all point in that direction!
Come on, let’s hurry and board the Hyotanjima Cruise!
Holmes:
Watson, you’re always too quick to trust appearances.
What truly matters is where the information comes from.
Watson:
Where it comes from...?
Holmes:
Yes. Who gave the clue, and why.
Without knowing the source, the conclusion is meaningless.
Watson:
Then... what we should be looking into is—
Holmes (putting on his hat):
Check the source.

The cache isn’t at the posted coordinates. Solve the puzzle to find the final coordinates.
Episode 1: Double Meaning
Episode 2: M is ...
Episode 3: An Ordinary Day
Episode 4: The Woman Returns
Episode 5: The Last Letter
Episode 6: The Five-Minute Encounter
Episode 7: The Key She Played
Episode 8: The Silent Stratagem
Episode 9: Where the Lights Cross