The Old Blue Castle Investigation Case

Chronology
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Episode 136-137 (Int. Episode {{{int-episode}}})
Information
Title:	The Old Blue Castle Investigation Case
Original airdate:	February 22, 1999 (Part 1) March 1, 1999 (Part 2) February 13, 2010 (Part 1, Remastered version) February 20, 2010 (Part 2, Remastered version)
Season:	6
Manga source:	Volume 20: File 10~Volume 21: File 3
Case
Cast:	Conan Edogawa Ai Haibara Professor Agasa
Case solved by:	Ai Haibara

Gadgets introduced

Wristwatch Flashlight
	Agasa added the flashlight function to Conan's watch

Cast

Characters
Conan Edogawa Ai Haibara Ayumi Yoshida Mitsuhiko Tsuburaya Genta Kojima Professor Agasa

Case

Situation

Part 1

The Detective Boys are on a camping trip but Professor Agasa forgot the tent. They then wander to a castle owned by an old mistress and learn that there's a secret treasure in the castle. Conan finds a clue to the treasure and enters a secret passage but is attacked by an unknown assailant.

Attempted Murder
	Victim: Conan Edogawa

Agasa and Ai realize that something has happened to Conan. Agasa is about to phone the police to investigate but upon seeing a secret agent, is knocked out by the same culprit.

Attempted Murder
	Victim: Professor Agasa

Part 2

When nighttime comes, Ai investigates freely and is accompanied by the Detective Boys. They enter the same secret passage as Conan did and wander out of another secret entrance. Genta remains trapped in the passage and captured by the culprit. Mitsuhiko investigates the doorway to the castle's tower and disappears. Ai and Ayumi investigate the abandoned tower of the castle and find the culprit using a secret entrance connected to the castle.

Attempted Murder
	Victim: Ayumi Yoshida, and Ai Haibara

People

Katsuo Tabata
	41 years old Mamiya family gardener

Mitsuru Mamiya
	49 years old Husband of the eldest Mamiya daughter (Married into the family)

Takahito Mamiya
	25 years old Son of the eldest Mamiya daughter

Masuyo Mamiya
	83 years old Head of the Mamiya family

Resolution

  Show spoilers »

They find a corpse and realize who the culprit is pretending to be, the mistress. When Ai and Ayumi were coming out from under a floor tile, the culprit grabs on and tries to kill them. Then Conan, Mitsuhiko, and Genta appear. After re-uniting with the everyone, Conan reveals the location of the treasure. The treasure was the castle, and a beautiful scene. The culprit breaks down realizing that they wasted 10 years and killed a huge number of people just for this. The culprit is captured.

Remastered version

A remastered version of both episodes aired on February 13th and 20th, 2010.

See also

• Season 6