Suzuki Jirokichi receives a letter from Kaito Kid which reveals that Kid plans on opening Jirokichi's impenetrable safe, the Iron Tanuki. The letter however is not written in Kid's usual style raising the ideal that an imposter is after Jirokichi's safe. Sonoko invites Ran, Kogoro, and Conan to Jirokichi's house. After examining the security of the safe, Kaito Kid's card, in its usual style, is found confirming Kaito Kid's plan to open the safe. Conan suspects that Kaito Kid is one of the three newly hired workers of Jirokichi. Jirokichi however countinues to proclaim it to be the work of an imposter, causing Conan to suspect Jirokichi's behavior.