Ran and Sonoko befriend a couple at a restaurant, but Ran finds the man's act suspicious. The next day Ran takes Conan and Sonoko to their house, Ran learns that the man's wife has an extremely expensive insurance and that he may be trying to wear her body out to kill her. After inspecting the newly built house for Sick building syndrome, Conan finds out that her husband did something to the car. They later catch him spraying poison into the ventilation system of the car. He reveals that his company pressured him along with his want for a car.