The Fossil Hunters — Marilyn Helmer

Shelley arrives at her aunt and uncle's cottage on Grey Rocks Lake and is excited to see her cousin Kyle. Her excitement quickly turns to disappointed when she discovers Kyle's friend Marcus is staying at the cottage too. Shelley feels left out of the boys' games. Then the fossil she found at the beach goes missing, and she thinks Marcus took it. But when Topper, Kyle's dog, loses her ball, Shelley and Marcus are given an opportunity to become friends.