When the first rainstorm in 100 years comes to Rainbow Towne, the children are frightened, and Nanny Mouse must explain to them the importance of rain. Throughout the thunder and lightning, Nanny Mouse shares God's gift of the rainbow and the promise that it signifies. And as the children creep out from under the bed, they are able to behold the beauty that God has created and understand that they are unique and special to him. By overcoming the frightening struggle of a thunderstorm, all the mice learn how to appreciate both raindrops and rainbows. Using her son's battle with cancer as inspiration, Terri Jones tells a story of overcoming trials and fear that will teach and comfort both parents and children.