Saint Carlo Acutis was only fifteen years old when he died of leukemia in 2006. Yet, in that short time, he left a legacy that continues to transform lives around the world. What were his childhood and youthful passions? Where did his prophetic vision of the internet as a tool for evangelization come from? What was his secret to achieving holiness? How did he win the friendship and affection of countless people who, even today, pray to him and ask for his intercession? Antonia Salzano Acutis, the saint's mother, combining narrative beauty with biographical rigor, has written this book to help many of his devotees come to know and love him. As its pages unfold, in addition to revealing the extraordinary life of the "millennial saint," readers discover that holiness is not something obsolete, inaccessible, or reserved for a select few, but rather a goal that can be achieved in the everyday life of today's world.