Conan's investigation leads him to realize how Kakuz? and Tango's murder was accomplished. Conan tranquilizes Kogoro and impersonates him with the voice changing bow tie to reveal that Kikuyo Tabata, the maid, is the murderer. He reveals Kikuyo served Kakuz? coffee laced with sleeping pills, thus causing Kakuz? to fall asleep. She then set up the scene by placing Kakuz? on top of a trolley and placing a glued noose around his neck. After setting up a line of books leading from the door to the trolley Kikuyo placed a vase in Kakuz?'s hand, warning him that if the vase dropped and broke, it would cause people to investigate the noise. When that happened, they would open the door to Kakuz?'s room and subsequently move the line of books which would cause the trolley to roll out from beneath him and result in his death. Conan explains that Tango was murdered in a similar fashion: he was tied up and thrown in a pool and was forced to stand on the tip of his toes to breathe. Eventually Tango's fatigue caused him to drown. By delaying the time of death in both cases, Kikuyo was able to establish an alibi. As for the dying message, Conan reveals that blood covered the kanji for the English word "Hades" which means "Meido" in Japanese and is a reference to the English word maid. As evidence, Conan tells the police Kikuyo should have a handkerchief with coffee stains tainted with sleeping pills. Kikuyo confesses to the murder revealing that Tango, with the help of his father, murdered her husband, the previous butler.