At only seventeen years old, Ross Quest is already a master thief, especially adept at escape plans. Until her plan to run away from her legendary family of thieves takes an unexpected turn, leaving her mother’s life hanging in the balance. In a desperate bid, she enters the Thieves’ Gambit, a series of dangerous, international heists where killing the competition isn’t exactly off limits, but the grand prize is a wish for anything in the world—a wish that could save her mom.

Sara Martinez is a hacker. She recently broke into the New York City foster care system to expose her foster parents as cheats and lawbreakers. However, instead of being hailed as a hero, Sara finds herself facing years in a juvenile detention facility and banned from using computers for the same stretch of time. Enter Mother, a British spy who not only gets Sara released from jail but also offers her a chance to make a home for herself within a secret MI5 agency. Operating out of a base in Scotland, the City Spies are five kids from various parts of the world.

Avery Grambs has a plan for a better future: Survive high school, win a scholarship, and get out. But her fortunes change in an instant when billionaire Tobias Hawthorne dies and leaves Avery virtually his entire fortune. The catch? Avery has no idea why - or even who Tobias Hawthorne is. To receive her inheritance, Avery must move into sprawling, secret passage-filled Hawthorne House, where every room bears the old man's touch - and his love of puzzles, riddles, and codes.

Nice Victorian ladies don’t run off to find legendary lost cities. One trifling little arrest shouldn’t have cost Ellie Mallory her job, but it’s only the latest in a line of injustices facing any educated woman with archaeological ambitions. When Ellie stumbles across the map to a mysterious ancient city, she knows she’s holding her chance to revolutionize Pre-Colombian history. There’s just one teensy complication.

Thanks to a DNA test, Avery knows that she’s not a Hawthorne by blood, but clues pile up hinting at a deeper connection to the family than she had ever imagined. As the mystery grows and the plot thickens, Grayson and Jameson, two of the enigmatic and magnetic Hawthorne grandsons, continue to pull Avery in different directions. And there are threats lurking around every corner, as adversaries emerge who will stop at nothing to see Avery out of the picture - by any means necessary.