The heir to one of the world's most influential families reckons with the demonic secret of their power in this contemporary dark fantasy that melds occult magic with shocking family drama, from the New York Times bestselling author of The Book of Accidents.

Mourning Mayne knows he'll one day bear the duty of managing his family's vast empire of wealth and power. But the feckless Mourning has always struggled to accept this legacy of cruelty, domination, and exploitation . . . and something even darker.

Because the Maynes are no ordinary family- Hidden in our world are the fiends-half-human, half-demon, and possessed of a dark magic born from buying human souls-and the Maynes are one of the oldest and most influential fiendish families.

But when Mourning's estranged father, the formidable and terrifying Hadrian Mayne, demands that Mourning return to the fold, he has to decide whether to accept his legacy and embrace his role in the family or to forge his own destiny, and with it, change the course of the world.

Because along the way home, he will meet Key, a black-market seller of human souls, and Quinn, an artist who may hold the dark truth behind the fate of the fiends. Alone, they have all struggled with the darkness of their natures. Together, they might find a path out of the shadows.