Heidi has spent her life protecting her autistic brother, Erik, from the worst of the foster care system they'd always lived in. Then, on a trip to Europe, Heidi sees an strange building and stranger people, including a viciously beautiful woman who tries to kill Heidi.
Heidi learns that she and Erik are Magecrafters, magic users of fae blood. She is a threadreader, who reads threads of the tapestry of reality, while Erik is a Gollemer, who animates objects. They have finally found where they belong, but the Unseelie Magecrafters are after a source of power and Heidi's new friends are in danger.
Can Heidi figure out her powers in time to help her friends?