It's been four months since the weirdest girl in school, Carly Smithson, seemingly vanished into thin air. Jen Rivers has moved to Spiritwood, and despite her appearance, she doesn't claim to know anything about it. However, the spy group Silver League is determined to uncover the truth behind both girls' actions.
As the second and third terms of school progress, the case becomes even more intriguing. They discover a way to contact Carly but are met with more questions than answers. The Shadowed Wolves, a rival spy club, are found to not be just a gathering of cryptography enthusiasts, but rather a pawn in Carly's game. In addition, one of the members knows a lot more than she is letting on. Along the way, the secrets that surround the League itself are revealed, and not all of the members agree on how to deal with them. Their friendships are tested as time goes on and they are forced to either accept each other's pasts or completely dissolve the club. Just as they reach the breaking point, they uncover evidence of a conspiracy that is so incriminating it sends the entire club reeling, and whether they want to or not, they are about to confront the very heart of the Gemini case.
