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. 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 MI6 agency.

Operating out of a base in Scotland, the City Spies are five kids from various parts of the world. When they're not attending the local boarding school, they're honing their unique skills, such as sleight of hand, breaking and entering, observation, and explosives. All of these allow them to go places in the world of espionage where adults can't.

Together, they face off against rival schools, track down a deadly mole in their own organization, and extract a fellow agent from a dangerous situation on foreign soil!

This thrilling hardcover boxed set includes:
City Spies
Golden Gate
Forbidden City