Temporarily restored to his normal size, Shinichi joins Ran and their friends on a trip to Kyoto. There, he meets Keiko, an old actress friend of his mother, who has received a strange code from a friend who committed suicide years ago.
Conan, Ran and Kogoro go to Northern Kyushu so Kogoro can accept an award for his detective work. They wind up investigating the potential attempted murder of the president of a trading company.
Kogoro is hired by a group of people when a prize race horse is kidnapped. It eventually turns out that the kidnapper's family was held hostage to make him to it, and things escalate into a potential murder.
While Conan and Agasa are both away, the rest of the Detective Boys overhear something at a food court that makes them think workers at a restaurant are planning a bombing.
The owner of a fossil museum recently who was recently revealed to have lied about findings at an excavation site is found fatally poisoned, and Conan suspects that it isn't a suicide.