Tintin The Complete Companion starts where Tintin and the World of Hergé stopped. An overview of the world-famous comic character and of his adventures through the 23 titles of the complete oeuvre, the Complete Companion contextualizes Hergé's work and places it in its historical period by showing side by side by side the drawings and the references used by the artist to establish believable backgrounds and realistic details.

Also included are large numbers of sketches that Herge would rework and polish until he would find the clearest, most easily readable line, giving birth to a style that would later be called the Clear Line.