Conan and Ran are invited by Sonoko to a dance party held by real estate company manager Takada Kensaku. Kensaku's wife Konomi and many other celebrities are also in attendance. During the party, Kensaku gets into trouble and leaves his seat, never to return. Yamazato Rika, a maid who was searching for Kensaku at Konomi's instructions, discovers Kensaku's body after he fell off a cliff. Party attendees behaving suspiciously, unnatural footprints left behind... Was this an accident caused by the victim losing his footing, or was it a murder?