Katwe slum in Kampala, Uganda, during the life of 10-year-old Fiona (Madina Nalwanga) and his family is a constant struggle. His change the world one day he meets Robert Katende (David Oyelouo) missionary who taught the children how to play chess. Fiona becomes liluratutahau game and soon, the best players at the forefront of Katende. His success in local competitions and championships bright future and the opportunity to open the door to escape the life of poverty.
