Dr. Linda Trevor listened intently as Holmes and Watson explained the case. Her eyes narrowed as she examined the note. "Ah, yes. I see. The language is quite symbolic, isn't it?"
Holmes nodded. "Indeed, Doctor. We believe it's a reference to the concept of the 'shadow self' in psychology."
Dr. Trevor nodded. "Exactly! The 'shadow self' refers to the repressed or hidden aspects of our personality. Kira is likely using this concept to hint at his own psychological state."
Watson's eyes widened. "You mean he's hiding something?"
Dr. Trevor smiled. "Not just something, Watson. Kira is hiding his true identity. The reflection of the soul he mentions is a metaphor for the true self, the one he's desperately trying to keep hidden."
Holmes's eyes sparkled with excitement. "Ah, the game's afoot, Watson! We have our first lead. Let us follow the trail of psychological breadcrumbs and uncover the truth behind Kira's enigmatic message!"
And with that, the investigation continued, delving deeper into the mind of the elusive Kira.