Solo (Souleymane Sy Savane) is a Senegalese taxi driver whose latest fare, a weathered and despondent old Southerner named William (West), offers him a large sum of money to drive to a mountain peak, where it appears that William is going to commit suicide. A good-natured and kind-spirited man, Solo is disturbed by this revelation, and out of a deep sense of purpose, he embarks on a mission to save William.