The Popcorn Moon Detectives: Why does the moon keep changing? And where does it go when it disappears? Two curious sisters are on the case!Amy can't stop staring at the night sky. The moon seems to come and go, changing shapes and playing tricks. When her sister Lisa rolls her eyes one time too many, Amy decides it's time for a real investigation-she's going to become a Moon Detective! From "Popcorn Moon" craters to moonlight giggles, Amy and Lisa set out to solve the mystery of the moon's disappearing act. With help from their mom, they discover the magic of lunar phases-and learn that some mysteries in the sky are just waiting to be explored.