On a walk with Ran, Conan runs into Takagi who explains that Katsugoro Kitamura, the president of a construction company, is found dead from a stab wound. The suspect, Yuuichi Minamida, is in custody while the police attempt to figure out how the murder was done. The knife angle on the body suggests Kitamura was murdered by someone shorter than him; Minamida is 20 cm taller than Kitamura making it technically impossible. Conan drops subtle hints allowing Takagi to solve the murder. Takagi reveals that Minamida unscrewed the light bulbs in Kitamura's room. During the meeting, Kitamura uses a step ladder to fix the lights but is stabbed by Minamida. As evidence, Takagi reveals that there is a lack of evidence on the light bulbs even though Kitamura changed them recently. Minamida confesses to the crime and reveals that Kitamura had been blackmailing him for the land below Minamida's restaurant. The restaurant was the gift his father gave him after he was shunned by his family for a murder he did not commit.