Meitantei Conan

Synopsis

Sterling Alexander, president of Alexander Industries, requests Richard's help to watch after his two daughters, Autumn and Summer, as he is about to die of a disease diagnosed by his personal physician, Dr. Preston. At Sterling's manor, Conan witnesses Autumn poisoning a bottle of wine and is chloroformed, later deduced by Sterling himself, who, in turn, dies after consuming the wine anyway. Autumn is arrested, though Conan remains unsatisfied and finds a hidden camera and wine in a decorative plant, then knocks Richard out to explain that Sterling concocted a plan to see if his daughters would try to kill him; he never drank the wine but was still killed. The doctor is revealed to be the real killer who diagnosed him with a fake disease then used Sterling's plan against Sterling and injected him with a lethal dose. The entire incident is caught on camera. Dr. Preston confesses, stating Sterling drove his father, who was his business partner, into bankruptcy, the latter killed himself because of it and his sick mother died shortly afterwards. Dr. Preston is arrested for murder.

(Source: Wikipedia)