In a quaint English village called Wall, young Tristan Thorn is determined to win the heart of the beautiful but shallow Victoria. After witnessing a falling star, Tristan vows to retrieve it to prove his love, promising Victoria he will return with it. Crossing a forbidden wall, Tristan enters a mystical, magical realm where stars can take human form. He discovers the star is, in fact, a woman named Yvaine. Unbeknownst to Tristan, a trio of ancient witches, led by the sinister Lamia, also seek the star to harness her powers and rejuvenate their youth.

Meanwhile, the kingdom of Stormhold has its own intrigue, with princes vying for the throne left vacant by the deceased king. As Tristan and Yvaine journey through the magical land, encountering fantastical creatures and fearsome adversaries, they form an unexpected bond. Their adventure is a race against time, as malevolent forces close in, each with their own dark designs on Yvaine's celestial heart. The duo faces hurdles and dangers but also finds allies in the most unexpected places.