Sage has lived in the Kingdom of Ruin her whole life. From morning to evening, she has spent the last eighteen years practicing her skills and performing her duties, all in preparation to take her Vows and be confirmed into the Coventry of Sisterwitches. She and her twelve Sisters have never left the Forest, and nobody has come to disturb them for hundreds of years - until a lone Princeling with an arm made of stone somehow finds his way to their door.
Suddenly, Sage is swept up in a game of wits that stretches far beyond the small world where she grew up, a place filled with courts of stone and castles of riddles and humans; and it is now her job to unravel the strange series of misfortunes, the Blight, that has befallen these people - completely, and utterly, alone. As Sage attempts to discover who, or what, is causing the Blight, she stumbles across secrets that have lasted longer than the Kingdoms themselves, and sets in motion a series of events that will change the history of witches forever.