2023’s A Sleight of Shadows is the second volume in Kat Howard’s Unseen World series. The first volume was An Unkindness of Magicians, whose review may be found here.
During the revolution called the Turning, Sydney sacrificed her magic to bring down the malevolent House of Shadows. Thanks to Sydney, the mages of the Unseen World can no longer draw their power from the slaves of the House of Shadows. They must draw on their own power. That’s painful.
Many sorcerers are unhappy with the new state of affairs. Spells may not work; using magic hurts. Ill-will is building. Can the Turning be reversed?
As it happens, the House of Shadows has begun reassembling itself without human intervention.