"Fish Marks The Spot" / "The Coded Map of the City Case" (Episode 4)

After visiting an exhibit on hidden treasures, Conan and his friends find a piece of paper with symbols and the word "Oro" written on it. A treasure hunt ensues, but without much avail. Conan, who has not been interesting in the children's treasure hunt, finally believes that the paper a treasure map after he discovers "Oro" means gold in Italian. Later, in the night, Conan realizes that the symbols refer to neon light signs on buildings. Following the clues, they find gold coins hanging from the ceiling of an abandoned building. three men were revealed to have been following the kids. With Conan's quick thinking, they are able to capture the men. It is revealed later the three men were Mafia members and the gold was hidden from them by a tratorious accomplice. Later, Amy gives Conan a kiss on the cheek, thanking him for saving them while Mitch and George stare jealously.

SOURCE:

http://en.wikipedia.org/wiki/List_of_Case_Closed_episodes_(season_1)