Mystery writer Ishioka gives lectures in Spoke English school at the invitation of Satomi, a university girl. In the school, he meets Otawara, a lonely old man. Three of them become good friends. Sweet-tempered but eccentric Otawara disappears mysteriously after entertaining Ishioka and Satomi on Christmas eve. A series of mysterious incidents happen one after another. The famous detective Mitarai staying abroad offers help. A miserable past surfaces...
