Cassandra “Cass” Carroway has spent her whole life searching for belonging. The only daughter of Regulus Black, she was born after her father’s death — the secret legacy of the man who tried to undo Voldemort’s darkest deed. Her mother fled to America to keep her safe, but after her death, Cass, sixteen and fiercely independent, escapes an abusive foster family and travels across the ocean to find the only name her mother ever spoke with hope — Sirius Black.