The Sliver Wizard And The Sorcerer's Stone

A boy named Luke lives in an orphanage in London where he is taken by someone named Yaxley,soon Yaxley,a serpent named Nagini and others named Death Eaters experiment on Luke. Luke soon becomes an Animagus before Luke soon escapes the Death Eaters before being found by the Headmaster of Hogwarts. Soon Luke attends a magic school known as Hogwarts where he meets three students that will soon become his life long friends. What happened to Luke's parents? What animal can Luke transform into?