Allison is a vibrant seven-year-old who is stricken with a terminal heart illness. Rainbows have always been her favorite, but they become more meaningful as her body gradually weakens. Although the different colors of the rainbow bring comfort to Allison, they also bring sadness. Remembering her colorful life before her illness makes Allison want to give up on everything. With help from her mom and friends, the colors of the rainbow eventually bring new meaning to Allison's life, which help her enjoy the life she is now living, despite her terminal illness.