In twelve-year-old Giacomo's Renaissance-inspired world, art is powerful, dangerous, and outlawed. A few artists possess Geniuses, birdlike creatures that are the living embodiment of an artist's creative spirit. Those caught with one face a punishment akin to death, so when Giacomo discovers he has a Genius, he knows he's in serious trouble. Luckily, he finds safety in a secret studio where young artists and their Geniuses train in sacred geometry to channel their creative energies as weapons. But when a murderous artist goes after the three Sacred Tools--objects that would allow him to destroy the world and everyone in his path—Giacomo and his friends must risk their lives to stop him.