During a school field trip, Conan and Rachel end up in a mountain cabin with several members of the teaching staff. Conan gets quite a surprise when he answers the doorbell and a frozen teacher's corpse falls into the house! To add to the mystery, a strange letter is written on the teacher's hand, which sends another of the educators running to his room. Shortly after, he's found dead too! Later, Conan runs into a famous singer who is later kidnapped. After solving it, Richard comes upon a murder of a man in a loan company. ( )