216화: 코난은 도난당한 보트와 켄스케와 쿠마다의 익사 사건 뒤에 숨겨진 진실을 밝혀낸다.

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Conan believes that Kumada was met with foul play. He also finds out that a boat and anchor were stolen right before Kensuke's boat capsized. After visiting Masahiko's house, gaining insight from witnesses, and finding a dog house sign on the property, Conan puts Kogoro to sleep, deducing that the killer drugged Kensuke while he was out with Kumada. The killer disguised themselves as Kumada, lowered an anchor into the sea attached to the boat, then waited for the tide to rise. When this occurs, the anchor weighs the boat down making it capsize, and the unconscious Kensuke sinks to the bottom of the sea and drowns. Kumada was murdered in a similar fashion; he, too, was drugged and was pulled up via a noose around his neck. The killer is Yaeko Kamei, Kensuke's caretaker; her real name is Tamiko Tsuruta, and in turn, is revealed to be Masahiko's mother, the man who was murdered by Kumada. Evidence supporting these theories is how Yohan knew Yaeko even through her disguise. Yaeko confesses and though the case went to trial, Kensuke, knowing every detail in Masahiko's death, acquitted Kumada of the murder for profit. She is arrested for her murders. (Source: Wikipedia)