Look at the map that comes with the book. Friends of the author have roads in their name, Thomson road, Norcie road, etc. How do I know this? The authors kid goes to my school and showed it to me. Also notice how the setting is in "Spittsburgh". The author...
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Turn to page 29. It features a puzzle in which you must guess the correct phone number. All of the phone numbers are those of the authors friends. If you want, try calling them, the area code on all of them is 412!