Taylor Cook thought the invasion was just a bad dream. She'd heard about teens who were suddenly developing incredible abilities, but she had never really believed it. Not until the day she discovered she was one of them - a human with Legacies. Now Taylor is being sent off to the Human Garde Academy. A place where recruits from across the globe can learn to control their new powers and discover what they are truly capable of. But not everyone thinks that's the best use of their talents.

The Human Garde Academy was created in the aftermath of an alien invasion of Earth. It was meant to provide a safe haven for teens across the globe who were suddenly developing incredible powers known as Legacies. Taylor Cook was one of the newest students and had no idea if she’d ever fit in. But when she was mysteriously abducted, her friends broke every rule in the book to save her. In the process, they uncovered a secret organization that was not only behind Taylor’s kidnapping but also the disappearance of numerous teens with abilities.

It's a year since John Smith and the Lorien Garde helped defeat the Mogadorian invasion of Earth. Now all over the planet teenagers are developing new powers - new Legacies. But this terrifies everyone else. Those with Legacies are cast out of families. Hunted down. Murdered. So the Garde create an academy. A place where the gifted may come and learn in safety. They will be trained to use their powers to help protect humankind. But some of them believe there's a better use of their talents. They have other plans. And they don't care who dies in order to bring them about.... 

After the battle in Switzerland, the Fugitive Six find their loyalties torn, splitting them into two factions. Taylor, Nigel and Kopano join Nine to return to the Academy, but nothing is the same. Fear and resentment of the Human Garde has been growing, and the Academy is under siege. The United Nations has decreed that all humans with Legacies must be implanted with inhibitors, a move that will take away their power and their human rights. The team have no choice but to fight back.