The main book the high school is mentioned in.

Clarksville Valley High School is the high school where the adoption conference was held. Chip, Jonah, and Katherine went there with Michael Skidmore and Linda Skidmore. This is where they find the other thirty-six Missing Children and where they are sent back in time in Sent. It is a fairly new school with newly built houses surrounding it. It is also right by a nature preserve, which is where the time cave is hidden.