The "Numa Files" is a series of adventure novels written by author Clive Cussler. The series follows the adventures of Kurt Austin, a special projects director for the National Underwater and Marine Agency (NUMA). The stories often involve underwater exploration, historical mysteries, and high-stakes action. Each book in the series features a mix of real historical events and fictional elements, showcasing Cussler's passion for marine archaeology. The novels are known for their fast-paced plots and engaging characters, appealing to fans of adventure and thriller genres.