An ordinary muggle girl with a painfully boring life suddenly wakes up in the body of Cassian Rosier, a wealthy pureblood Slytherin boy at Hogwarts. Forced to pretend to be him, she must survive magic, dangerous pureblood society, and Cassian’s intensely close friendships with Draco, Mattheo, Theo, Blaise, and Lorenzo—while hiding the truth that beneath the perfect Slytherin heir is actually a terrified muggleborn girl.