Kogoro, intrigued by the mystery of the locket and the disappearance, agrees to take the case. Conan, however, is already suspicious, noticing a slight hesitation in Yukie’s eyes whenever she mentions the locket.
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. Detective Conan Episode 406
Conan then looks into the locket. He asks Ran to investigate Yukie’s past. Ran discovers that Yukie had a younger sister named who died in a car accident ten years ago. In the accident, a drunk driver hit their car. The drunk driver? A young, promising architect named Keisuke Sonoda. Kogoro, intrigued by the mystery of the locket