Guardians of the Crystal Skulls: The Thirteenth Order Book

Rachel, a naive farm woman who has led a sheltered life, partners with the alien beings that live in Mt. Shasta. Since she is the only human who the aliens trust, her mission is one of life and death for humanity. She is catapulted on a journey teeming with challenges as she travels across the United States hunting attunement crystals to repair their spaceships and ultimately, she must venture into outer space to locate and replace the crystal skulls back in the grid. If the axis shift is not corrected, and soon, every inhabitant is threatened with annihilation including the alien race who has protected humanity for hundreds of millennia.