Four decades of peace have done little to ease the mistrust between humans and dragons in the kingdom of Goredd. Folding themselves into human shape, dragons attend court as ambassadors, and lend their rational, mathematical minds to universities as scholars and teachers. As the treaty's anniversary draws near, however, tensions are high. Seraphina Dombegh has reason to fear both sides. An unusually gifted musician, she joins the court just as a member of the royal family is murdered.

There are those who would give their lives to keep it hidden. And those who would destroy it. But the only people who will truly find the Serpent are those who have awakened to the world around them—with eyes open to the wondrous, the terrible, and the just.

In the medieval kingdom of Goredd, women are expected to be ladies, men are their protectors, and dragons can be whomever they choose. Tess is none of these things. Tess is...different. She speaks out of turn, has wild ideas, and can't seem to keep out of trouble. Then Tess goes too far. Tess's family decide the only path for her is a nunnery. But on the day she is to join the nuns, Tess chooses a different path for herself. She cuts her hair, pulls on her boots, and sets out on a journey. She's not running away, she's running towards something.

Hava sails across the sea toward Monsea with her sister, the royal entourage, and the world’s only copies of the formulas for the zilfium weapon she saved at the end of Winterkeep. During the crossing, Hava makes an unexpected discovery about one of the ship’s crew, but before she can unravel the mystery, storms drive their ship off course, wrecking them in the ice far north of the Royal Continent.

To all the world, Alizeh is a disposable servant, not the long-lost heir to an ancient Jinn kingdom forced to hide in plain sight. The crown prince, Kamran, has heard the prophecies foretelling the death of his king. But he could never have imagined that the servant girl with the strange eyes, the girl he can’t put out of his mind, would one day soon uproot his kingdom—and the world.