Shinichi solves the riddle and heads to the school and finds the next riddle on a stop sign. The letter contains a mixture of kanji, and mahjong symbols and when read, pronounces Beika City Hall. Once there, Shinichi finds a sign on a pole with the message "S ? W". Shinichi presumes it means the sunset and assumes his father created the riddle for his entertainment. Back in the present time, Conan realizes what the riddle actually means. Conan writes down the symbols for port, castle, flood gate, post office, middle school, and city hall. It is revealed "S ? W" means South to West, so when the symbols are turned 90 degrees, reveals Ox hide in kanji. Conan rips open the leather wallet which reveals a message for Yusaku Kudo from the original Phantom Thief Kid, a single question mark. In the past, Yukiko Kudo is having dinner with Toichi Kuroba and hands him a letter from Yusaku which contains a single exclamation mark.