Natalie: We know how you did it, Marty. We figured it out.
Marty Eels: How I did what?
Natalie: Didn't your mother ever tell you that cheaters never win?
Adrian Monk: Actually, it was your mother's idea. She works for Pacific Global Airlines, doesn't she? In the quality control department?
Marty Eels: Yeah, so?
Adrian Monk: Here's what happened. After the murderers, Blanchard and Dial, went back to their motel room, counted their jewels. And then they called the airlines to buy plane tickets to Costa Rica. They were put on hold. What they didn't know was that your mother was already on the line monitoring their call. They must have been on hold for quite a while, because they talked about everything. Who they killed, where they dumped the car, even where they hid the masks.
Natalie: But she didn't call the police. She called you. And told you everything you needed to know to solve the case.
Adrian Monk: Or at least pretend to solve it.
Marty Eels: You're a very smart man.
Natalie: Yeah, he's the real thing.
Marty Eels: Yeah. Of course, you realize you have no proof for any of this.
Natalie: Don't airlines record phone conversations?
Adrian Monk: Yes, Nat, I believe they do.
Marty Eels: Yes, they certainly do. But those conversations have a way of being accidentally erased. So it's really your word against mine. And who do you think everyone's gonna believe? The amazing Marty Eels or yesterday's news? [phone rings] Phone's been ringing off the hook. Case, cases, cases. Would you mind?