Colors on the loose! Annie and Mike are making a box fort when a bunch of little rainbows mysteriously appear on the family room wall. Are they from a sprinkler? A gas puddle? A necklace? Annie and Mike need scientific detective skills to solve this rainbow mystery! Books in this perfect STEM series will help kids think like scientists and get ahead in the classroom. Activities and experiments are included in every book! (Level Two; Science topic: Rainbows)