While attending a car show to investigate a death threat, a man is found killed by carbon monoxide-intoxication.

Kogoro, Ran, and Conan are staying at a hotel when they run into Kogoro's estranged wife, Eri Kirisaki. Eri is at the hotel with colleagues of hers. Kogoro is upset seeing Eri around another man and proceeds to get drunk. He is later found in the bed of Eri's female colleage, who has been murdered!