The Absence

After brilliant studies in France and a 15-year absence from his homeland, Adama, a young graduate of the Ecole Polytechnique, rushes back to Senegal. He is alarmed by a message informing him of the sudden decline in his grandmother's health. Upon arriving in Dakar, Adama discovers that his grandmother is in perfect shape... Was this a deliberate ploy to get him back home, and if so, why?