Seventeen-year-old Aderyn ("Ryn") only cares about two things: her family, and her family's graveyard. And right now, both are in dire straits. Since the death of their parents, Ryn and her siblings have been scraping together a meager existence as gravediggers in the remote village of Colbren, which sits at the foot of a harsh and deadly mountain range that was once home to the fae. The problem with being a gravedigger in Colbren, though, is that the dead don't always stay dead. The risen corpses are known as "bone houses," and legend says that they're the result of a decades-old curse. When Ellis, an apprentice mapmaker with a mysterious past, arrives in town, the bone houses attack with new ferocity. What is it that draws them near? And more importantly, how can they be stopped for good? Together, Ellis and Ryn embark on a journey that will take them deep into the heart of the mountains, where they will have to face both the curse and the long-hidden truths about themselves.

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. All magic comes with a price, though, and for years the sisters have been separated. Esther has fled to a remote base in Antarctica to escape the fate that killed her own mother, and Joanna's isolated herself in their family home in Vermont, devoting her life to the study of these cherished volumes. But after their father dies suddenly while reading a book Joanna has never seen before, the sisters must reunite to preserve their family legacy. In the process, they'll uncover a world of magic far bigger and more dangerous than they ever imagined, and all the secrets their parents kept hidden; secrets that span centuries, continents, and even other libraries . . .

From the nationally bestselling author of The Luminous Dead and The Death of Jane Lawrence, a transfixing, intensely atmospheric fever dream of medieval horror. Aymar Castle has been under siege for six months. Food is running low and there has been no sign of rescue. But just as the survivors consider deliberately thinning their number, the castle stores are replenished. The sick are healed. And the divine figures of the Constant Lady and her Saints have arrived, despite the barricaded gates, offering succor in return for adoration. Soon, the entire castle is under the sway of their saviors, partaking in intoxicating feasts of terrible origin. The war hero Ser Voyne gives her allegiance to the Constant Lady. Phosyne, a disorganized, paranoid nun-turned-sorceress, races to unravel the mystery of these new visitors and exonerate her experiments as their source. And in the bowels of the castle, a serving girl, Treila, is torn between her thirst for a secret vengeance against Voyne and the desperate need to escape from the horrors that are unfolding within Aymar’s walls. As the castle descends into bacchanalian madness—forgetting the massed army beyond its walls in favor of hedonistic ecstasy—these three women are the only ones to still see their situation for what it is. But they are not immune from the temptations of the castle’s new masters… or each other; and their shifting alliances and entangled pasts bring violence to the surface. To save the castle, and themselves, will take a reimagining of who they are, and a reorganization of the very world itself.