Case Closed

Season 1, Episode 222

Episode Title: And There Were No Mermaids (The Murder)

Air Date: 2001-01-29

Overview:

Conan, along with Heiji, Ran, and Kazuha travel the Isle of Mermaids looking for Saori Kadowaki, who had sent a letter to Heiji asking him to save her from being killed by a mermaid.