Detective — Conan Episode 406

Suddenly, the doorbell rings. Ran rushes to answer, hoping for a client. A well-dressed, distressed woman in her late twenties stands at the door. She introduces herself as . She explains that her husband, Keisuke Sonoda , a successful architect, has been missing for three days. She has already contacted the police, but since there’s no evidence of a crime, they have only issued a missing person notice and are not actively investigating. Desperate, she has come to the famous "Sleeping Kogoro" for help.

Ran, watching, has tears in her eyes. Conan, however, remains stoic but somber. He concludes: "The locket was supposed to be a memento of atonement, but it became a motive for murder. A coincidence of timing and hidden truths." Detective Conan Episode 406

The episode begins on a peaceful, rainy afternoon. Ran Mouri is cleaning the agency when she notices Conan Edogawa staring out the window, deep in thought. Kogoro Mouri is, as usual, sitting at his desk with a can of beer and a horse racing newspaper, grumbling about his losses. Ran scolds him for being lazy and not having any clients. Suddenly, the doorbell rings

Yukie explains the circumstances of her husband’s disappearance. Three days ago, Keisuke left their home in the morning saying he was going to visit a construction site in the neighboring city. He took his car. He never returned, and his phone has been turned off since that afternoon. The police tracked his car’s GPS, but the signal was lost in a remote mountainous area on the outskirts of town. She introduces herself as

She provides a photograph of her husband—a handsome man in his early thirties with a confident smile. She also mentions that he was wearing a distinctive silver locket around his neck, which he never took off. Inside the locket is a small, old photograph of a young girl, not her. When Kogoro asks about this, Yukie looks down sadly and says, "He never told me who she was. He said it was a memento of a promise he made a long time ago."

Further down, at the bottom of the cliff, they can see the river rushing over rocks. Police divers are called in. They find the body of Keisuke Sonoda in the river. The cause of death is blunt force trauma to the head, consistent with a fall from the cliff. However, there are also traces of sleeping pills in his stomach.

Kogoro, Ran, and Conan drive to the area where Keisuke’s car signal was last detected. It is a narrow, winding mountain road surrounded by dense forest. After searching for a while, they spot a dark blue sedan crashed into a ditch off the side of the road. The car is empty, but the doors are unlocked.