Fedele alla linea is an investigation into the figure of Giovanni Lindo Ferretti: a contemporary singer, songwriter and poet, who in his 30-year career has never ceased to provoke conflicting opinions and positions. It is not a musical documentary, but an intimate dialogue between him and the director, linked by a friendship that can be traced back to the years when Ferretti, master of a workshop – in the medieval sense – of music and communication, had Germano Maccioni among his students.