After obtaining an old "Boca de Estrella" guitar like the one played by tango icon Carlos Gardel, tango musician and guitar collector Patricio Crom sets out to restore the instrument and discover its true sound, then use it in a concert with some of the best contemporary Argentine tango guitarists. Along the way, Crom explores different guitar playing techniques, the challenges of guitar construction and restoration, and the enduring passion for Carlos Gardel.