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Conan, Ran, and Sonoko are out to eat at a café and befriend a couple. Something seems strange about the couple to Ran, so she goes to visit them and learns something unsettling.
The family reveals the deceased grandfather hid stamps worth a fortune. Conan and Kogoro help solve the case and find the lost treasure!
While attending a car show to investigate a death threat, a man is found killed by carbon monoxide-intoxication.