Lily and Amanda Smart are lucky girls. They live in a tall house made of purple bricks, and every day they get to walk to school through a park filled with beautiful trees. Their favourite tree is the Giggle Gum, and they look forward to playing in it. But not everyone likes the Giggle Gum because it has overgrown a pathway nearby. Some people complain, and soon the Tree Police put up a sign saying the Giggle Gum Tree is going to be cut down. Afraid they'll lose their leafy friend, Lily and Amanda come up with a plan to save it. But will it be too late?