Cruise Ship Serial Murder Case (Part 1)

Synopsis

Kogoro, Ran, and Conan miss the boat home after a vacation and accept a ride with the rich Hatamoto family (consisting of the clan head Hatamoto Gozo, his granddaughter Hatamoto Natsue, Natsue's husband Hatamoto Takeshi, Natsue's sister Hatamoto Akie, Akie's husband Hatamoto Tatsuo, his 2nd son Hatamoto Joji, his grandson Hatamoto Ichiro, his eldest daughter Hatamoto Mariko, Mariko's husband Hatamoto Kitaro, and the family butler Suzuki Kenji) on their private ship. Gozo, the head of the family, humiliates Ichiro while he is sketching, then requests Takashi to meet him in private. It is revealed that Takashi is actually the son of Edward Zimmers, a man Gozo put out of business. Later that night, Gozo is murdered and a bread crumb is found in a pool of his blood. Takashi, the only one with a motive, is locked in a cabin. Everyone in the family, with interest in the Hatamoto inheritance, is shocked to find out that Natsue will inherit everything as requested in Gozo's will. An enraged Tatsuo leaves but is found brutally murdered and Takashi is missing from the storage room. Kogoro concludes that Takashi has escaped to continue his killing spree. (Source: Wikipedia)