Commander Nathan Whitaker: Detective Monk. What part of "confined to quarters" don't you understand?
Adrian Monk: I thought you'd like to know how the investigation is going. I'm getting closer.
Commander Nathan Whitaker: Closer? To what?
Adrian Monk: To- To the truth. I have the "who." I have the "why." All I need is "how."
Commander Nathan Whitaker: Come here. You have something to say to me?
Adrian Monk: You did it. You killed Lt. Commander Pierce and I know why. It was the accident last January. You hit a mountain. I still can't believe it. How do you hit a mountain? But you knew it was a career-ending mistake. You convinced Lt. Commander Pierce to help you cover it up. You switched charts so that you could tell everyone that it wasn't your fault, that you'd been given a chart that was out of date. But one sailor, a kid named Jonesy had been badly hurt. And when Jonesy died, Lt. Commander Pierce had a change of heart, and he told you he wanted to confess.
Commander Nathan Whitaker: So I killed him to protect my reputation, to save my career, so I wouldn't disappoint dead daddy? Is that your story?
Adrian Monk: Something like that.
Commander Nathan Whitaker: What about the gunshot from inside the room? There were three witnesses, can you explain that?
Adrian Monk: Not yet.
Commander Nathan Whitaker: Lt. Commander Pierce's death was a suicide. I'll tell you how I know. Because I said it was! When I'm on land, I'ma decorated Commander in the United States Navy. When I'm on this ship, I am the lord thy God! I am Jehovah! Do you understand? No one questions me! Now, I've asked around. I know all about your problems. Your fears, your claustrophobia. You are having a breakdown, sir. It happens on submarines all the time to men far better than you. You are delusional.
Adrian Monk: I have my share of problems. I don't deny it. But when it comes to this case, the last thing I am is delusional. [to imaginary Dr. Bell] Tell him. ... Does that sound delusional to you?