The Idea Factory - A Little Light Traitor
The book starts off with some FBI agents looking into a room where a fourteen year old girl is sitting alone, handcuffed to the desk. They talk about her having committed treason, making it clear that this isn't in doubt. But they need to figure out the why of it. If someone put her up to it or of she was working on her own. The book switches off between the interrogation, flashbacks from her point of view, and the investigation that is happening while they interrogate her.