Ikenga by Nnedi Okorafor

Nnamdi’s father was a good chief of police, perhaps the best Kalaria had ever had. He was determined to root out the criminals that had invaded the town. But then he was murdered, and most people believed the Chief of Chiefs, most powerful of the criminals, was responsible. Nnamdi has vowed to avenge his father, but he wonders what a twelve-year-old boy can do. Until a mysterious nighttime meeting, the gift of a magical object that enables super powers, and a charge to use those powers for good changes his life forever. How can he fulfill his mission? How will he learn to control his newfound powers?