2003, Colorado: Alexandra Solarin is summoned home to her family' ancestral Rocky Mountain hideaway for her mother's birthday. Thirty years ago, her parents, Cat Velis and Alexander Solarin, believed that they had scattered the pieces of the Montglane Service around the world. When Alexandra arrives her mother is missing and a mysterious group of houseguests have arrived, along with her aunt and the most powerful piece of Charlemagne's service.

In an alternate history of New York, three kids try to solve a modern-world puzzle and complete a treasure hunt laid into the streets and buildings of the city.

"With the defeat of the Overtakers behind them, the five teenagers known as the Kingdom Keepers should be celebrating. By all accounts they saved Disneyland from certain destruction. Why then did their mentor leave one last puzzle for them to decipher? The Keepers must solve a puzzle of the past, or be crushed under an evil that makes the Overtakers seem like gentle souls"--