"A documentary about one of the world's most beautiful and mysterious creatures: the Monarch butterfly. Nowhere in nature is there a more powerful mix of scientific marvel, awesome beauty, and epic struggle for survival. What scientists are at a loss to fully explain is how the Monarch makes a seemingly impossible three thousand kilometre journey from Canada over mountains, through storms, and across large bodies of water to its small and remote over-wintering grounds in the mountains of Mexico"--NFB web site. The film also visits the residents of the town of Mariposa, Mexico - whose traditions hold that the butterflies are the returning souls of the dead - but this ancient tradition is now threatened, as the habitat of the butterflies disappears through logging, etc.