Nansubuga Nagadya Isdahl 
Sing to the Moon [PDF ebook] 

Jjajja tells me, "Sing to the Moon, " and perhaps my wishes will come true soon.For one little Ugandan boy, no wish is too big. First he dreams of reaching the stars and then of riding a supernova straight to Mars. But on a rainy day at his grandfather’s house, he is brought down to earth with a bump. Do adventures only happen in galaxies far away, or can he find magic a little closer to home? A touching story steeped in Ugandan culture of a grandfather’s love for his grandson and the quiet pleasures of a rainy day.