She used to work for the United States government, but very few people ever knew that. An expert in her field, she was one of the darkest secrets of an agency so clandestine it doesn't even have a name. And when they decided she was a liability, they came for her without warning. Now, she rarely stays in the same place or uses the same name for long. They've killed the only person she trusted,...

Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, and international spy ring, and a Scottish castle.

Born to slave-holding aristocracy in Richmond, Virginia, and educated by Northern Quakers, Elizabeth Van Lew was a paradox of her time. When her native state seceded in 1861, Van Lew's convictions compelled her to defy the new Confederate regime. Pledging her loyalty to the Lincoln White House, her courage would never waver, even as her wartime actions threatened not only her reputation, but also her life.

After the death of the uncle who had been his guardian, fourteen-year-old Alex Rider is coerced to continue his uncle's dangerous work for Britain's intelligence agency, MI6.

The lives of Skip Sands, a spy-in-training engaged in psychological operations against the Vietcong, and brothers Bill and James Houston, young men who drift out of the Arizona desert into a war, intertwine in a novel of America during the Vietnam War.

When a terrifying encounter in London reveals that one of her most-trusted allies is actually a rogue double-agent, Cammie Morgan no longer knows if she can trust her classmates, her teachers--or even her own heart.

Vivian Miller is a dedicated CIA counterintelligence analyst assigned to uncover the leaders of Russian sleeper cells in the United States. On track for a much-needed promotion, she's developed a system for identifying Russian agents, seemingly normal people living in plain sight. After accessing the computer of a potential Russian operative, Vivian stumbles on a secret dossier of deep-cover agents within America's borders. A few clicks later, everything...

Fourteen-year-old Wyatt avoids a prison sentence by agreeing to spend three months in a secret government training camp for teenage agents, but when enemies try to root out Camp Valor's secrets, Wyatt and his friends have to put their training into practice to protect their country.

"Jessie Archer is a member of the Athena Protocol, an elite organization of female spies who enact vigilante justice around the world. Athena operatives are never supposed to shoot to kill--so when Jessie can't stop herself from pulling the trigger, she gets kicked out of the organization, right before a huge mission to take down a human trafficker in Belgrade. Jessie needs to right her wrong and prove herself, so she starts her own investigation...

While trying out the spy glasses, spy hat, and other items in their new spy kit, seven-year-old Henry and his dog Mudge make a new friend and form a spy club.