Looking back from 2024, is essential because it launched the "Bourbon Arc" (Episodes 509–783). The mysterious "Bourbon" (Rei Furuya) is one of the Organization’s top agents, and the hunt for his identity begins here. While Subaru Okiya is eventually revealed to be Shuichi Akai in disguise, the paranoia sparked in this episode—wondering if every new character is Bourbon—lasts for six real-world years.
By this episode, Conan has already encountered several Black Organization members in disguise (e.g., Vermouth, Jodie Starling, Shuichi Akagi). He senses that Amuro is different—not a friend, but not obviously hostile. This sets up the long-running tension between Conan and Amuro, who will later become an uneasy ally.
The defining moment of occurs in the final ten minutes. After solving the playwright murder (the killer used a piano wire and a melody to create an alibi), Conan returns home to find Subaru Okiya standing outside his front door. Okiya is stirring a can of coffee—a seemingly trivial detail that sends chills down the spines of long-time viewers.
The narrative hook of Episode 506 is built on a subversion of expectations. Eri Kisaki is introduced as a woman of immense composure and intellect, yet the episode plunges her into a situation where her legal expertise is rendered useless by physical isolation and immediate danger. By having her kidnapped and confined, the story strips away her usual armor. This creates a high-stakes environment that forces the supporting cast—specifically Ran and Conan—to navigate a maze of subtle clues to find her. The episode excels at utilizing "The Queen’s" perspective to build tension, showing her resourceful attempts to communicate her location despite her captors' vigilance.