After and end of the diptych made with hands of masters by Juanjo Guarnido and Juan Diaz Canales! By investigating Solomon, the master builder of New York at the origin of the immense bridge under construction, Blacksad discovers that the empire of the falcon is built on a heap of corpses including Iris Allen, the theatre director, is not the first victim. Pied by Solomon, Weekly is then accused of the murder. A real race against the watch begins for Blacksad in order to gather the evidence innocent of his friend and allowing to bring down the architect while reconnecting with his love, Alma, whose role in this matter will be decisive.