There's a new resident in Castle Key - and somebody is watching him! Scott, Jack, Emily and Drift soon suspect that the new resident is an enemy spy. It explains the bullet-proof glass in the windows of his house. And the MI5 agent who is clearly keeping tabs on him! But what is an enemy spy doing in Castle Key? Can the friends reveal his true identity? And uncover his top secret mission? Join Scott, Jack, Emily and Drift as they investigate a man so mysterious he's almost invisible!

From the award-winning author of The Great Trouble comes a story of espionage, survival, and friendship during World War II. Bertie Bradshaw never set out to become a spy. He never imagined traipsing around war-torn London, solving ciphers, practicing surveillance, and searching for a traitor to the Allied forces. He certainly never expected that a strong-willed American girl named Eleanor would play Watson to his Holmes (or Holmes to his Watson, depending on who you ask). But when a young woman goes missing, leaving behind a coded notebook, Bertie is determined to solve the mystery. With the help of Eleanor and his friend David, a Jewish refugee--and, of course, his trusty pup, Little Roo--Bertie must decipher the notebook in time to stop a double agent from spilling the biggest secret of all to the Nazis. From the author of The Great Trouble, this suspenseful WWII adventure reminds us that times of war call for bravery, brains and teamwork from even the most unlikely heroes.

X-Men meets Spy Kids in the thrilling second installment in The Forgotten Five fantasy/adventure series that began with the instant New York Times bestseller Map of Flames. The forgotten five have made it to Estero to search for their missing supernatural criminal parents. With the help of their new allies, Lada and The Librarian, they’ve managed to find Birdie and Brix’s mother, Elena, and free her from captivity in the presidential palace. Now the president’s henchmen are searching everywhere for the children who broke out Elena, driving the group into hiding in the ancient underground tunnels beneath the city. Meanwhile, President Fuerte is making headlines for his nighttime flights to other countries accompanied by an invisible man. But why would the president who outlawed supernaturals be working with the people he supposedly hates? And could it be that some of the five’s own parents are helping him? The fantasy adventure that began with the New York Times and Indie bestseller Map of Flames continues as the five join the fight against the oppression of supernaturals in Estero, face off against an unexpected enemy, and undertake a new mission that will put all of their abilities—and their loyalties—to the test.

X-Men meets Spy Kids in this instant New York Times bestseller! Here’s the first book in a new middle-grade fantasy/adventure series from the author of The Unwanteds. Fifteen years ago, eight supernatural criminals fled Estero City to make a new life in an isolated tropical hideout. Over time, seven of them disappeared without a trace, presumed captured or killed. And now, the remaining one has died. Left behind to fend for themselves are the criminals’ five children, each with superpowers of their own: Birdie can communicate with animals. Brix has athletic abilities and can heal quickly. Tenner can swim like a fish and can see in the dark and hear from a distance. Seven’s skin camouflages to match whatever is around him. Cabot hasn’t shown signs of any unusual power—yet. Then one day Birdie finds a map among her father’s things that leads to a secret stash. There is also a note: Go to Estero, find your mother, and give her the map. The five have lived their entire lives in isolation. What would it mean to follow the map to a strange world full of things they’ve only heard about, like cell phones, cars, and electricity? A world where, thanks to their parents, being supernatural is a crime?

Dead drops, cyphers, and invisible ink are all part of a mystery that even spymaster George Washington would love. Sam, Derek, and Caitlin love solving mysteries, and when they visit Washington, DC, spies are lurking. What starts out as a fun game of pretend on the National Mall turns all too real when they follow a mysterious man to a meeting deep within the Capitol. To keep government secrets from falling into the wrong hands, the kids must work with federal agents and travel to historic Mount Vernon for a state dinner with the president and his son. Dead drops, cyphers and spy chases are all part of what might be their most dangerous adventure ever--if it isn't their last. Spies at Mount Vernon is the seventh book in The Virginia Mysteries series, but it also makes a great standalone read. The story is the perfect complement to social studies units covering George Washington as well as field trips and family vacations to Washington, DC and Mount Vernon. If you enjoy mystery and adventure like the Hardy Boys, Nancy Drew, Magic Tree House, or National Treasure, you'll love author Steven K. Smith's exciting middle-grade series. The stories are modern-day fictional mysteries with twists of real locations and events from Virginia history. These fast-paced books are popular with both boys and girls ages 7-12, appealing to even reluctant readers Buy Spies at Mount Vernon and unlock the adventure today

Chip, an invisible boy, and his friends solve the mystery of who took the school ball from the playground

When someone takes Justin's karate belt, his friends in Invisible Inc. try to determine a motive as they investigate the mystery.