Alice and Hugo Black are French pureblood siblings who carry a rare and dangerously powerful form of ancient magic. But when Hugo is six, his magic begins to manifest in an unstable and overwhelming way, causing him physical distress and revealing the true extent of his extraordinary power. This attracts the attention of Albus Dumbledore, who invites them to Hogwarts for protection and guidance. Although Hugo is far too young to be a student, he is allowed to remain at Hogwarts under special permission due to the danger and rarity of his abilities. Alice is placed directly into her fifth year in Slytherin, where she must adapt to a world she left behind while protecting her brother at all costs. As tensions rise with the return of dark forces and the growing influence of Voldemort and the Death Eaters, Hugo’s uncontrollable ancient magic becomes both a threat and a target. Hidden within the castle and shielded from attention, the siblings are drawn into a deeper mystery surrounding their power—one that many would seek to control, or destroy.