The Keeping Place: The Obernewtyn Chronicles 4

When a Misfit is kidnapped, Elspeth finds she has little choice but to join the growing rebellion against the Council. Her extraordinary mental powers could tip the scales of the struggle, but Elspeth feels torn between toppling the corrupt authoritarian regime and seeking clues vital to a more personal quest—her ambition to destroy what remains of the Beforetime weaponmachines.