Ato and his friends Dzifa and Leslie have been selected to visit Nnoma, the bird sanctuary that Ato's father helped build before he died. Ato is convinced that his father hid something valuable on the island, meant only for him. When the trio arrives at Nnoma with other children from across West Africa, they are split into teams and given missions to help broaden their knowledge of nature. The winners will become Asafo-ambassadors of Nnoma and defenders of the Earth. But then the adults running Nnoma start behaving erratically and Ato suspects foul play. When the trio uncovers a sinister plot to exploit the sanctuary, Ato and his friends must work together to protect it-and his father's legacy.

Kirkus praised Crossing the Stream as "a powerful coming-of-age story of self-discovery" in their starred review. Now, Flying Up the Mountain calls upon each of us to do our part in safeguarding our planet.