Havana, Cuba, 1990. René González, an airplane pilot, unexpectedly flees the country, leaving behind his wife Olga and his daughter Irma, and begins a new life in Miami, where he becomes a member of an anti-Castro organization.

Cuban filmmaker Enrique "Kiki" Álvarez's newest feature paints a slow-burning love story set in the years immediately following the Cuban Revolution in January of 1959. The Black Box is a secret diary written by Elsa and read by her granddaughter several decades later, a film about a young woman who finds and reads the experiential, emotional and political legacy that her grandmother has left hidden like a magical object. Featuring rare footage from the beginning of the Cuban Revolution.