Come Back to the Five and Dime, Stephen King, Stephen King - S7-E4
Continuity mistake: In the opening scene the kid on the left's mask keeps changing from on to off between shots.
Continuity mistake: Mac says he went through Marine Corps boot camp, but in the flashback in 'Crossroads', he's in the army.
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.