The second in the electrifying NUMA FILES series starring Kurt Austin of the National Underwater and Marine Agency Planet earth is a paradox - a lush, fertile world three-quarters-covered by water, yet in danger of running dry. Fresh water is disappearing from overuse and pollution and the only hope lies in desalination, a process to convert salt water into fresh. Francesca Carval is a brilliant scientist whose newest discovery will save the human race. She…