Mouri is targeted by a killer who is after Kimura. Mouri accidentally took his jacket at a bar and now the killer is trying to kill him. Conan finds out that Kimura is not who he seems to be. Kimura is said to be at a lake and Mouri goes to investigate. There he is seemingly shot by the culprit but, in fact, Conan has set a dummy in Mouri's place. The culprit reveals his motive was revenge.

It is revealed that the house hold are killed off one by one in the order of the C Concert scale. The grandmother of the house was revealed to be emotionally shocked after the death of her son; Every midnight, she would leave her room carrying the Stradivarius like a child. That night, she breaks the violin, and falls out of the window. It was revealed the culprit taped up an object to lure her to the window where she would fall to her doom.