Tachibana, a famous non-fiction writer, holds a party and presents a cryptic problem to his guests. Those who clear this problem can find the whereabouts of the draft of his new piece of work. The party guests all compete to find the draft, as it is said to contain the name of a criminal who is attending the party. Meanwhile, Kindaichi helps Yurina Katsuragi when he sees the drunk Tachibana harassing her. This makes Tachibana furious. Later, Kindaichi goes to make amends with the author. Saki begins to worry that Kindaichi is taking too long and goes to look for him, but what he finds is Kindaichi standing over Tachibana's body, holding a bloodied murder weapon. Kindaichi pleads his innocence, but the party guests corner Kindaichi and call the police. However, Kindaichi goes missing by the time they arrive and the prime suspect for the murder is none other than Kindaichi himself. As the police surround the area, Kindaichi embarks on his escape.
