This arc is adapted from Files 781–786 in Volume 74 of the manga series.
The episode narrows the focus to five people close to the family—Serika Wakamatsu, Masashige Shiina, Sumio Fujinami, Yoshimi Satake, and Sakurako Yonehara—all of whom have an "S" in their name, matching a clue in the dying message. Key Plot Developments Detective Conan Episode 653
Conan and Heiji investigate how only one piece of an evenly cut cake was poisoned. They discover a biodegradable capsule in a tea cup, suggesting the poison was delivered through a clever concealment method. This arc is adapted from Files 781–786 in