Kit has been cursed into a body that isn't her own. Idris has been cursed to dance to death. If they want to break their curses, they'll need to work together.

Kit and her step-sister Catharine have been close ever since their parents' royal marriage brought them together. But living under the king's roof is not safe for Kit, and illness is spreading through her joints. Her mother tells her it is a curse: When a woman in their family is hurt, they fall into a wasting sickness. When an enchantment switches Kit and Catharine's bodies, Kit must find a way to make things right. But can she really bear to go back to her wasting body?

Idris has learned a dark secret about his family and a crime they committed generations ago against the Hidden Folk. When he gets the chance to atone, he takes it?even though it means he will be danced to death. But it is one thing to agree to be a martyr, and another to watch his choice destroy his family. Can he find a way to bring justice and still live?

If Kit and Idris want to survive, they will need to work together. But lines blur as the two grow closer. There are few ways to break a curse, and there may not be enough magic left to break them all.