The Clue in the Locker Room

Jason was just sitting at home when the phone rang. Putting down the mystery novel he was reading, he reached over to the phone on his bedside table and answered it.

"Hello?" he answered.

"Jason, is Carl there?" a voice asked, apprehensive.

"No, Mrs. Henson. Is something wrong?" he asked.

"Carl was supposed to come home after football practice, but he never showed up," she answered, worried.

"Don't worry. I'll go look for him and I'll let you know if I find him," Jason assured the worried mother. After being thanked, Jason hung up the phone. Then, he put on his shoes, collected his car keys and drove in the direction of the school.

Pulling into the parking lot, Jason wondered where he should begin.