Thompson, Eileen books

The blue-stone mystery (1963)

Chip Trainor threw his gym shoes into the air and caught them again. "Hooray! Yippee! No more lessons for three months. New Mexico, here we come!" He saw his ten-year-old sister ahead of him and hurried to catch up with her. "Hey, Karen. Wait. Do The Blue-Stone Mystery you suppose Mom and Dad are...