Dan's Boss - S3-E7
Continuity mistake: Near the end, when Dan sets the books and folders down to get a salad, the folders on top slide off the books. Dan ends up leaving it as is when he walks away, but in the next shot the folders are back on the books.
Answer: It's possible when Harry called the military, he implied that the book contained sensitive information, seeing as how many government and military officials were part of the client list.
I thought it was because he developed feelings for the madam and couldn't bring himself to turn her in.