Antimony Carver and friend Kat begin their second year at Gunnerkrigg Court. They find a tomb of ancient robots which leads the two friends to question how they are linked to the mysterious ghost that attacked Annie the year before.

Antimony Carver is a precocious and preternaturally self-possessed young girl starting her first year of school at gloomy Gunnerkrigg Court, a very British boarding school that has robots running around along side body-snatching demons, forest gods, and the odd mythical creature.

Annie returns from the forest and begins her third year at the Court. Her experience has left her changed, causing Kat to worry as they both struggle to find their place while their life changes around them. Together with their friends, they start to form a plan of action to deal with the tortured ghost they encountered the previous year, and in doing so, help Robot and Shadow form a new bond after a terrible accident. Annie continues to develop her...