Numbers from Heaven, begins with the story of Zoey Zebra and her best friend P.B., the panda bear. They discover a treasure chest left for Zoey by her grandpa. When the two friends open the chest, it’s filled with hundreds of keys. Each key opens a new treasure chest that unlocks one key to knowledge and wisdom … two very different things. This series has over 50 beautifully illustrated books by artist Kimmo Hellström on Mathematics, Science, Zoology, Literature, and more.