Throughout the course of history, civilizations have used warriors in a variety of ways. From the Roman Gladiators who fought for the entertainment of the emperor to the savage raids of the Nordic Vikings, this new series explores every facet of the life and times of some of history's most celebrated, and notorious, warriors. Dressed all in black, sneaking through the night--Ninja's were mysterious and stealthy warriors. But how did people get chosen to be Ninjas? What kind of training did they have to undergo? Do they still exist today? Ninjas: Masters of Stealth and Secrecy explores all these questions and more in this comprehensive look into the life and times of Ninjas.