The Assassin's Creed game series divided into two worlds, the present and various lives of your character, Desmond Miles. The games provide a mixture of amount of real-time combat, conspiricy, and driving story.
You play the role of Desmond Miles, a man in his mid twenties, born into the order of Assassin's, however when he was younger he rejected his lineage and ran away. He was then captured by Abstergo Indurstries, and was forced to use a device known as an Animus which uses a person's DNA to relive the lives of their ancestors. It is here where the saga begins.