Ep. 10: Sakons Puppet: The Ghost Chapter - Part III

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Sakon deduces from evidence that a left-handed person committed both murders, but everyone there is right-handed. Sako discovers that Aoki, an assistant with his head bandaged from a fire years earlier, is really left-handed. Sakon uses Ukon to mimic the voices of the dead men, tricking Aoki into confessing that he is the killer. It is revealed that Aoki is in reality the ex-husband of Keiko, Hayami's partner, and Aoki is seeking revenge for the death of their daughter years earlier in the fire that disfigured him when he tried to save her. (Source: Wikipedia)