In Arboral Year 1294, the world is dominated by nine massive towers known as the Spires, remnants of an advanced civilization. Filled with lost secrets and powerful knowledge, nations struggle to possess them. Luca is a bugler in a mercenary company who wants nothing more than to leave the battlefield behind and become a true musician, a maestro. But marked as one of the enigmatic Branch-hexed, and gifted with the strange ability to see the sound of his instrument, Luca finds himself drawn reluctantly into a war of epic proportions!

With the defeat of the Looking Glass, Luca has gained more experience and understanding of just what his Branch power can do. It has also made him more determined than ever to complete his service to the Pontiff's Holy Realm and live his life free of war. But that time is pushed farther into the future when a new campaign into the Duchy of Normandie is announced. This mission will take him and his Branched companions deep into enemy territory to hunt down the Garland. It will also take them deeper into the mysteries held by the enigmatic Spires, and those who control them...