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.

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.

Theodosia was six when her country was invaded and her mother, the Fire Queen, was murdered before her eyes. On that day, the Kaiser took Theodosia's family, her land, and her name. Theo was crowned Ash Princess - a title of shame to bear in her new life as a prisoner. For 10 years, Theo has been a captive in her own palace. She's endured the relentless abuse and ridicule of the Kaiser and his court. She is powerless, surviving in her new world only by burying the girl she was deep inside.

Brie hates the Fae and refuses to have anything to do with them, even if that means starving on the street. But when her sister is sold to the sadistic king of the Unseelie court to pay a debt, she'll do whatever it takes to get her back—including making a deal with the king himself to steal three magical relics from the Seelie court.

Kell is one of the last Travelers - magicians with a rare, coveted ability to travel between parallel universes. As such, he can choose where he lands. There's Grey London, dirty and boring, without any magic, ruled by a mad King George. Then there's Red London, where life and magic are revered, and the Maresh Dynasty presides over a flourishing empire. There's White London, ruled by whoever has murdered their way to the throne. And once upon a time, there was Black London...but no one speaks of that now.