Spoilers: This article reveals the killer, method and concealed wrongdoing.
The Secret Hidden By the Cards, international episode 1166 (Japanese episode 1108), is an anime-original case. Popular card player Nitta kills Masaki after creating the commotion of a falling shelf. The crucial evidence is not simply the hidden line that topples it, but blood spatter that places Nitta close to the later killing.
The card table has a hierarchy of its own
Mitsuhiko and Genta are playing at a trading-card table in a secondhand bookshop while Conan, Ayumi, Haibara and Professor Agasa accompany them. The arrival of tournament regulars Nitta, Masaki, Zaizen and Kuno changes the atmosphere.
Nitta is admired for beating opponents with expensive rare cards while using cheaper cards himself. Zaizen leaves for the restroom as he habitually does and orders Kuno to watch his valuable collection. Even before anything violent happens, status and possession are visibly shaping the room.
Masaki’s pointed warning to Zaizen introduces the possibility of a secret being used as leverage. The important question is not only who plays best, but who has power over whom away from the game. That threatening undertone turns an enthusiastic hobby setting into a plausible source of conflict.
From evacuation to an apparent fatal accident
A shelf suddenly collapses, followed by a fire alarm and evacuation. In the confusion, everyone’s priority is getting out. When the group returns, Masaki is missing, and an initially ordinary explanation remains possible: perhaps he simply escaped elsewhere.
His body is eventually found in the storeroom, apparently beneath a fallen shelf. The surroundings encourage the inference that the collapse killed him. Conan instead tests whether the positions, injuries and traces agree with that interpretation.
The difference between an accident and a murder lies in the interval created by the commotion. If the shelf was deliberately toppled to empty the shop, then its fall can be the preparation for a killing rather than the cause of the death.
What Nitta used the line to accomplish
Nitta loops fishing line over a nail near the top of the shelf and attaches the other end to his belt. A movement of his body tensions the line and topples the shelf without the obvious gesture of pushing it by hand.
Conan notices that Nitta moves diagonally forward rather than simply sideways, as well as his movement toward his belt. Those small details become meaningful once the line mechanism is understood. The attention around the card game gives the preparation a setting in which a subtle movement can go unnoticed.
The collapse and fire commotion create an opportunity to remain inside and kill Masaki. During the subsequent search, Nitta also tries to remove the evidence of the mechanism, walking over the fallen shelf and cutting the line while appearing to help find the missing man.
The solution therefore needs two distinct propositions: Nitta caused the collapse, and Masaki was killed afterward at close range. Explaining the shelf alone would not fully explain the murder.
The blood at his feet breaks the accident story
Blood spatter on the toe area of Nitta’s shoe is inconsistent with the distance and orientation he claims to have occupied when the shelf fell. It places him near Masaki when the victim was bleeding, undermining the supposed accidental sequence.
The distinction between the spectacular disruption and the small physical trace is satisfying. Nitta can dismantle a contraption, but that does not remove the evidence of his proximity to the actual attack. The blood answers the question the fishing line cannot answer on its own.
Professor Agasa serves as the voice of the explanation, with Conan supplying the deduction. That choice suits the group already present in the shop and makes the exposure feel different from a routine Kogoro performance.
The admired player was protecting a false image
Masaki had discovered that Nitta was committing thefts and was blackmailing him. Nitta feared losing the admired identity he had built and remaining subject to Masaki’s demands. He chose murder to silence the person who knew.
That motive changes the opening card-game admiration in retrospect. The appealing image of an underdog winning without expensive cards had obscured wrongdoing outside the matches. His concern for that image eventually destroys it.
The children’s enthusiasm and the adults’ anxiety over status make the setting more than a decorative backdrop. The final judgment on Nitta’s conduct carries weight precisely because he had been treated as someone worth admiring. The case ends with a clever physical deduction and a much less comfortable answer to what his success was hiding.
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