Ludlow claims that the receipt can prove Webster was in the restaurant at the same time that Natalie was in there with Julie, a few nights before the murder, and that he knows this because he is thorough in his investigation. Monk tries to get Ludlow to explain how he knows this, and Ludlow claims that he knows Webster, Natalie and Julie were all in Sorrento's at the same time because Webster saw the 10% discount advertised on Julie's cast. However, Monk points out that Ludlow isn't explaining how he can know about the discount when he's never met Julie, and reveals that Ludlow actually had been in San Francisco. Additionally, Monk explains that Ludlow, like the killers of his own books, has been betrayed by a very hidden personality quirk.