This Pencil Writes by itself. What Does a Pencil Know?

It's Caspian's UnBirthday again. This year, Grandpa gives him a pencil and a small pad of paper. When Caspian picks up the pencil, it writes the word APPLE. What does a pencil know? Grandpa says "It's a STAR adventure." But there are no apples in the house. Caspian rescues a runaway walker and returns it to the woman whose leg is in a cast. She gives him an orange. He trades the orange for two bananas. He trades the bananas for a worm. Eventually, he gets apples. The pencil tells him to take them to Miss Susie. What else does the pencil know?

Follow Caspian as he follows the clues.