Watch CineCalidad. Set in 1991 on the inner-city streets of Oakland, California, cocaine dealer Charles Cosby has his life is changed forever when he writes a fan letter to the "Cocaine Godmother" Griselda Blanco, who is serving time at a nearby federal prison. Six months later, Cosby is a multi-millionaire, Blanco's lover, and the head of her $40 million a year cocaine business.