[He immediately waves both hands defensively at that last bit. Wow, what an accusation.]

Heavens, no! I'm a good guy! My partner and I helped to uncover this whole plot! That's what detectives are for! Mr. Naruhodou, Miss Susato, my precious Iris... We all laid part of the road towards the truth.

It doesn't matter who the conspirators were, regardless. They've either been assassinated by the mastermind or locked away for their crimes. The mystery was solved and your father's name was cleared. [...Mostly. He did kill that one guy, so uh. Yeah.]