In this thrilling adventure by bestselling author Oliver Pötzsch, thirteen-year-old Lukas has been trained as a swordsman by his father, a nobleman who was once a famed Musketeer. When the threat of war and accusations of witchcraft spread across the land, Lukas’s life is forever changed. He flees his home and vows to find his missing sister.

Surviving as an outcast, Lukas encounters thieves and mercenaries, a strange astrologer, and a master swordsman. He also meets three other fencers—Giovanni, Paulus, and Jerome. Each brings a special talent to their team that leads them to the Black Musketeers, the best fighters in the army. But living with the black-armored Musketeers is nothing like they imagined. In his quest to find his sister, Lukas learns of a legendary book that holds powerful magic. As he fights to keep the Book of the Night out of the hands of his greatest enemy, Lukas discovers the secrets of his own family and what it really means to be a Musketeer.

A harsh winter is coming. With it, a dark and pitiless magic…

Lukas wants only two things: to rebuild his castle home in time to make it through the coming winter and to reconnect with the sister who was stolen from him in a plot against his family.

But then an astrologer appears with foreboding news: his old adversary, Inquisitor Waldemar von Schönborn, has stolen three royal artifacts, which are required to coronate a new German emperor. With these valuable objects—the sword, the crown, and the scepter—he could blackmail the empire. The treasures are currently hidden in three different places in the old imperial city of Prague.

To protect his homeland and help him find the artifacts, Lukas will need his three best friends—all members of the elite fighting group known as the Black Musketeers. He’ll also need his feisty little sister, Elsa, whose magical gifts may be the key to stopping the inquisitor’s latest scheme.

They head for Prague immediately, but the adventure that awaits them there will put their courage and their friendship to the ultimate test.