Conan, Kogoro, Amuro, and Irohazushi chef Wakita arrive at an abandoned church, where a series of murders occur. The group gathers around the four written codes that are the key to solving the mystery, but they struggle to decipher them. Just then, they receive a call from Nagano police inspector Yamato, who is clearing snow from the tunnel. He tells them that they will arrive in about three hours...