Filmmakers Lorena Munoz and Sergio Wolf trace the life of an iconic tango singer who vanished at the height of her career.  Ada Falcon was a tango diva. She sang on cinema screens. Her voice dominated the airwaves. Tabloids were preoccupied with whispered rumors of her tumultuous affair with her married conductor. And in 1942, at the height of her popularity, Ada Falcon announced she was retiring. Within months, one of the most famous singers in Argentina had simply vanished.  In their documentary, I Don’t Know What Your Eyes Have Done to Me (2003), filmmakers Lorena Munoz and Sergio Wolf trace Falcon’s life from