In this thrilling and bestselling series Stuart Gibbs called "a must-read" from Edgar Award winner James Ponti, five kids from all over the world become real-life spies--perfect for fans of Spy School and Mrs. Smith's Spy School for Girls. Books four through six are now together in a collectible hardcover boxed set! Operating out of a base in Scotland, the City Spies are six 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 secrets in the ancient City of the Dead, threats against the UN Headquarters in New York City, and saboteurs of a royal wedding in London.

This action-packed hardcover boxed set includes: City of the Dead Mission Manhattan London Calling