Detective Conan

Evil Intent Hidden Behind a Mask (18x4)

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Mouri, Ran, and Conan are attending a play when Conan overhears one of the actor's murder plan. He is later found eaves dropping and placed in a coffin. Later he over hears the other two actors who also plan a murder, meaning a murder triangle has been formed. After they seemingly all die, Conan is revealed to manage to save all of them having escaped from the coffin through a back door.