: Noboru Shimojo , who sought revenge for his father’s death years prior.

In Part 1 (Episode 245), Heiji and Kazuha are invited to a party on a boat. They meet the Tachibana family—four brothers who run a shipping company. The eldest brother is found dead in his cabin, which is locked from the inside. The murder weapon? A sharpened boat hook. Part 2 (Episode 246) focuses on the unraveling. While the local police (Yokomizo) assume suicide, Conan and Heiji realize the truth: the killer used a complex trick involving fishing lines, frozen rope, and the boat’s wake to create an impossible crime. The episode is famous for Heiji’s passionate deduction, Kazuha’s emotional support, and a rare moment where Conan takes a backseat to his rival.

The episode is known for a notable conversation between Ran and Haibara about Haibara's cold demeanor, where Haibara compares herself to a "shark".