Kogoro is invited as a guest to a wine appreciation party hosted by a wine collector named Murozou Honjou. While exploring the villa, Conan and Ran notice Honjou in an argument with a wine critic named Gorou Akamaru. From afar, Conan witnesses Honjou smashing a brick into Akamaru's skull. Conan runs to their location but is unable to find evidence of the assault. While Conan investigates, he notices blood in a barrel and realizes Akamaru's body was stored there but moved to a different location so he would not be found. Conan realizes the only room he had not investigated is the wine storage room which is secured by a system requiring Honjou's fingerprint. During a wine tasting ceremony, Honjou's prized wine has been found to have been shaken and subsequently caused the dregs to mix with the wine and ruining the taste. Conan examines the bottle and finds a bloody fingerprint; This leads him to conclude that Akamaru regained consciousness while imprisoned in the wine cellar and ruined Honjou's wine in an act of revenge. Using Kogoro, Conan tells the guests that an unknown culprit entered Honjou's wine cellar and ruined the wine purposely; The guests force Honjou to search his wine cellar and there they find Akamaru. Akamaru who is still alive regains consciousness in the hospital and Honjou is arrested.