"In my opinion, Dexter had no reason to do this."

Penn became even more furious, and his tone became sarcastic, "Then who else could it be? Yourself? Did you think the job was too tiring and created the poison to get rid of yourself once and for all?" He had me speechless for a moment.

Indeed, the three of us were responsible for this project.

I couldn't possibly harm myself, so it could only be Dave or Dexter.

But those two were the project leader and my longtime partner, respectively.

I didn't want to suspect either of them.

Penn chuckled mysteriously, "Your trust in Dexter comes from your years of...