On the Hill of Dust, in the remote mountains of Mexico, an eleven-year-old Mixtec boy called Teo lives with his family and the animals that he has healed, but one day a Romany caravan rolls into town with a young girl who calls herself Esma, the Gypsy Queen of Lightning--it is the beginning of a life-long friendship that will change both their lives.

Sixteen-year-old Sophie has been frail and delicate since her premature birth, but discovers her true strength during a journey through Mexico, where the six-year-old orphan her family hopes to adopt was born, and to Guatemala, where her would-be boyfriend hopes to find his mother and plans to remain.