In this spellbinding debut novel, two estranged half-sisters tasked with guarding their family’s library of magical books must work together to unravel a deadly secret at the heart of their collection—a tale of familial loyalty and betrayal, and the pursuit of magic and power. For generations, the Kalotay family has guarded a collection of ancient and rare books. Books that let a person walk through walls or manipulate the elements—books of magic that half-sisters Joanna and Esther have been raised to revere and protect. In the great tradition of Ninth House, The Magicians, and Practical Magic, this is a suspenseful and richly atmospheric novel that draws readers into a vast world filled with mystery and magic, romance, and intrigue—and marks the debut of an extraordinary new voice in speculative fiction.