Living among the ferns and flowers of Kew Gardens, Katy has always dreamed of more. She longs to sail the high seas in search of an epic adventure. Unfortunately, her father believes young girls should be content to stay at home.

When news reaches London of a meteorite landing in Brazil and an expedition being put together to find it, Katy knows it's her chance to follow her dreams and prove her father wrong.

Disguised as a boy, she manages to secure a place on the trip. And so begins her extraordinary voyage across oceans and through the jungle, on the trail of a fallen star ...