#3 The Secret Ghost: A Mystery with Distance and Measurement
Author: Melinda Thielbar , Illustrator: Yuko Geneviev Ota
Sam's little sister Michelle thinks there's a ghost in the creepy old house their dad bought. With help from a couple of friends on the soccer team, Sam, Amy, and Michelle use an old ghost story—plus measuring tools and calculations for distance, volume, and perimeters—to figure out the truth behind . . . The Secret Ghost.