Since I did not read the first installment of the Geniuses series, I entered the story line midway through. However, I was able to follow along pretty well. In this ancient Italian fantastic world, certain people are bestowed with magical artistic gifts attached to a Genius, an animal that channels those powers through a gem in its forehead. If the Genius dies, the human becomes a Lost Soul. Evil Supreme Creator, Nerezza, and her Genius, Victoria, rule the kingdom with terror & violence. Nerezza's goal is to gather all the Genius gems in the kingdom and all the Sacred Tools, and therefore, rule over all. Giacomo, a Tulpa created by his parents as a force of goodness, along with his teacher, Pietro and a cast of close friends, are doing everything they can to stop her. The second installment leaves off at a clear cliffhanger with Giacomo's fate twisted and hanging in the balance, so there will most likely be a third. Warrior Genius has magical battles, fascinating creatures, travel to distant strange lands, riffs and challenges between friends, and a large cast of characters. The villain feels most definitely villainous. "Good guys" sometimes become "bad guys" and vice versa. The heroes have some flaws and so also a little more depth. DiMartino does a good job of world building and explaining some complex mathematical and magical concepts in a way younger readers will understand. Black and white illustrations sprinkled throughout. Middle grade readers who enjoy action-packed adventure fantasy with a hero's quest will enjoy the Genius series for sure! Grades 4-8