While Marj is helping urban archeologists, she discovers a secret map that she has to hide from the authorities. It tells of an underground system of tunnels that cross through mazes of paths under North America, using old limestone caves and aquifers, even connecting to the old ICBM missle bases. It had been a long and brutal war. At the end, one side was banished underground, long decades ago. If this was true, the war may not be as over as they thought. She enlisted Rob to help her decipher this map and explore this underground world. They have to work in secret as many of their ""finds"" have been known to disappear, along with the discoverers. These two lone researchers find in each other more than they expected. And that just adds to the problems of decyphering and accessing the underground secrets of the Tunnel People... Get Your Copy Now.