Floating across the sky in her hot air balloon, Cassi watches a little swift dive and swoop through the still air. In the rising sun the world seems to be holding its breath. Then a small breeze stirs the leaves in the trees, and as the wind grows bolder, a whiff of danger sends small creatures running for cover. Across the ocean, the wind awakes with a fury, whipping the waves, cresting each one with wild, white horses. And further on, around the still eye of a hurricane, clouds are carved into a great spiral, howling with stormy power . . .
And throughout, the wind in all its guises is witnessed by Cassi's little swift as it embarks on its mammoth migratory journey, finally coming to nest on the other side of the world.