Desperate to save the life of their queen and her unborn child, the good people of Corona search for the all-healing Sundrop flower to cure her—but mistakenly acquire the shimmering Moondropflower instead. Nonetheless it heals the queen, and she delivers a healthy baby girl with hair as silver and gray as the moon. With it comes dangerous magical powers: the power to hurt, not heal. For her safety and the safety of the kingdom, Rapunzel is locked in a tower and put under the care of powerful goodwife, Mother Gothel.

For eighteen years Rapunzel stays locked away, knowing she must protect others from her magical hair. But when she leaves the only home she's ever known, wanting only to see the floating lights that appear on her birthday, she gets caught up in an adventure across the kingdom with two thieves—a young woman named Gina, and Flynn Rider, a rogue on the run. Before she can reach her happy ending, Rapunzel learns that there may be more to her story, and her magical tresses, than she ever knew.