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 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. Before she knows what she’s doing, Sarah is heading to Paris for an international youth summit, hacking into a rival school’s computer to prevent them from winning a million euros, dangling thirty feet off the side of a building, and trying to stop a villain…all while navigating the complex dynamics of her new team. No one said saving the world was easy…

After thwarting a notorious villain at an eco-summit in Paris, the City Spies are gearing up for their next mission. Operating out of a base in Scotland, this secret team of young agents working for the British Secret Intelligence Service’s MI6 division have honed 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. Fourteen-year-old Sydney is a surfer and a rebel from Bondi Beach, Australia. She’s also a field ops specialist for the City Spies. Sydney is excited to learn that she’ll be going undercover on the marine research vessel the Sylvia Earle. But things don’t go exactly as planned, and while Sydney does find herself in the spotlight, it’s not in the way she was hoping. Meanwhile, there’s been some new intel regarding a potential mole within the organization, offering the spies a lead that takes them to San Francisco, California. But as they investigate a spy who died at the Botanical Gardens, they discover that they are also being investigated. And soon, they’re caught up in an adventure filled with rogue missions and double agents!

In this third “thrilling” (Kirkus Reviews) installment in the New York Times bestselling series from Edgar Award winner James Ponti, the young group of spies help a fellow agent in another international adventure perfect for fans of Spy School and Mrs. Smith’s Spy School for Girls. After taking down a mole within their organization, the City Spies are ready for their next mission—once again using their unique skills and ability to infiltrate places adults can’t. The sinister Umbra has their sights set on recruiting a North Korean nuclear physicist by any means necessary, and the City Spies plan to keep an eye on his son by sending Paris to the chess prodigy’s tournaments in Moscow and Beijing. Meanwhile, Sydney’s embedded as a junior reporter for a teen lifestyle site as she follows the daughter of a British billionaire on tour with the biggest act on her father’s music label to uncover what links both the band and the billionaire have to a recent threat from an old Soviet missile base. From a daring break-in at one of London’s most exclusive homes to a dangerous undercover mission to a desperate search and rescue operation on the streets of Beijing, the City Spies have their work cut out for them on their most dangerous mission yet.

In this fourth installment in the New York Times bestselling series from Edgar Award winner James Ponti, the young group of spies go codebreaking in Cairo in another international adventure perfect for fans of Spy School and Mrs. Smith’s Spy School for Girls. Codename Kathmandu, better known as Kat, loves logic and order, has a favorite eight-digit number, and can spot a pattern from a mile away. So when a series of cyberattacks hits key locations in London while the spies are testing security for the British Museum, it’s clear that Kat’s skill for finding reason in what seems like randomness makes her the perfect candidate to lead the job. And while the team follows the deciphered messages to Egypt and the ancient City of the Dead to discover who is behind the attacks and why, Kat soon realizes that there’s another layer to the mystery. With more players, more clues, and involving higher levels of British Intelligence than ever before, this mission is one of the most complex that the group has faced to date. And it’s also going to bring about a change to the City Spies…

The City Spies head to the Big Apple when a credible threat is made to a young climate activist who is scheduled to speak in front of the upcoming United Nations General Assembly. With Rio acting as alpha and a new member in their ranks, the team’s mission to protect a fellow teen takes them on an exciting adventure in, around, and even under the greatest city in the world as they follow leads to the outer boroughs, the UN Headquarters, and even the usually off-limits stacks that extend deep under the main branch of the New York Public Library.

In this sixth installment in the New York Times bestselling series from Edgar Award winner James Ponti, the young group of spies stage a rescue in Rome. Cairo, the newest member of the City Spies, takes the lead when his sister disappears in Istanbul. Determined to save the family of one of their own, the team risks discovery as their search leads them to Rome. Meanwhile, there’s been intel that seems to threaten the royal wedding about to take place in Westminster, bringing the team back to the UK on an official case for MI6. With so much security all over the city, it’s harder than ever for the City Spies to go unnoticed. Will their skills be up to the task?