Hall of Infinite Doors

As your goal is to prevent the blackmail, you decide to find out who took the pictures. You set off the early the next morning in search of a late model gray Pontiac Grand Prix. You wander the parking lots until classtime, but without luck. After classes you find one in the parking lot, but it belongs to a teacher. The next one belongs to a large guy who probably has nothing to do with anything except eating. Finally you give up and go home.

That Sunday, however, you find exactly what you're looking for in the parking lot closest to the Sigma Chi sorority house. You're pretty certain that this is the car. You copy down the plates and then: