FROM THE WALL STREET JOURNAL BEST SELLING AUTHOR OF THE CHRONOS FILES. Could an ancient Martian artifact hold the key to saving Earth? When a chamber containing inscriptions from an ancient civilization is found deep below the surface of Mars, science reporter Claire Echols is thrilled to be covering the story of the century. But someone seems determined to stop her. Is it the wealthy entrepreneur leading the ongoing terraforming effort? The mining companies desperate to protect their livelihoods? The cult leader who wants to end all scientific progress? What's inside that chamber could be the key to saving Earth ... and someone is willing to kill to keep it hidden. "WALKER WRITES BOOKS THAT ARE HARD TO PUT DOWN." - BOING BOING