Meitantei Conan

Synopsis

Two TV producers, a man named Shogo Somei and a woman named Maiko Kazumi, ask Kogoro to star on his own show. Kogoro agrees and they plan a meeting for the following day. The next day, Somei picks Kogoro, Ran, and Conan up to meet with his manager, Raisaku Nakame, to discuss the show. When they arrive to Nakame's apartment on the twentieth floor, Somei reveals that Nakame had been talking about killing himself lately, prompting the idea Nakame has committed suicide. They call the apartment manager who opens the door and cuts the door chain allowing them access to the room. They find Nakame who had died poisoned coffee.

The police suspect the possibility of murder with the hypothesis that the culprit offered Nakame poisoned coffee before leaving and told Nakame to lock his door with a door chain. Conan investigates the coffee stains and realizes the culprit was with Nakame before he died; This means the culprit somehow placed the door chain back on the door before leaving. The police suspect Somei to be the culprit and that he had tampered the scene to hide how the murder was done.

(Source: detectiveconanworld)