Roderick Brody: Oh, I know she's lying. I just can't figure out why. I've been sitting here for two hours wrecking my brain.
Adrian Monk: Racking your brain.
Roderick Brody: Here's what I know, okay? I know I didn't do it. And I know she didn't do it cause I was with her all night.
Adrian Monk: Where did she get the knife. [walks towards mirror]
Roderick Brody: I don't know. Where did she get the knife? I can't figure it. Something's going on here but I... Are you okay?
Adrian Monk: That's me.
Roderick Brody: Yeah. It's a mirror.
Adrian Monk: Oh, my God. She did it.
Roderick Brody: Who did what?
Adrian Monk: Marilyn. Your wife. Last night she was at the hotel. She killed Doug Fendle.
Roderick Brody: I feel like I'm in eighth grade geometry class here I don't understand. I told you I was with her. Was she with me or was she at the hotel?
Adrian Monk: Yes. And no. She was with you and she was at the hotel.
Roderick Brody: She was both?
Adrian Monk: Twins.