Your dad is out of town on business, but a mysterious stranger asks you to help him. It could save his life, but brings you into a world of intrigue that spans from California to Washington, DC. Using your intellect and ability to decode puzzles through Algebra or Geometry, you solve the essential clues necessary to become a respected spy. Each chapter has a section to decode using your choice of Algebra or Geometry. Once you get the correct answer, which is in the key, you can move onto the next section to continue your adventure as spy extraordinaire. Continue your adventure in the next volume