Kogoro and Conan visits a famous author named Osamu Umezu in order to have his book signed. Later they spot Osamu's secretary, Mikami Touru, running to Osamu's house. They learn that Mikami that Osamu is not answering his phone calls and he was going to check up on him. They accompany him to Osamu's apartment and find Osamu dead. Evidence suggests it was suicide but Kogoro notices blood on the trash bin and reveals that it was a murder. Osamu's assistant and son are suspects to the murder due to being the only ones with keys to the apartment. Conan investigates and after putting Kogoro to sleep, impersonates him and reveals the murderer to be Mikami. He reveals that Mikami tied a string on the roof where it hung in front of Osamu's window. After poisoning Osamu, Mikami left the apartment and locked the door. He after wards went to the roof and using the string he set up, sends the key back to Osamu's apartment. Conan reveals that Osamu's died holding his trophy he won with his book. Conan explains the trophy was held upside down to reveal Osamu's book titles were and Mikami's name was also palindromes. As evidence, Conan reveals that Osamu managed to rip a button from Mikami's shirt and using the gum he had, stuck it onto the sofa. Mikami confesses to his crime and reveals that Osamu stole his manuscript and published the book as his own.
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