The Area 51 novels are a series of science fiction

Science fiction

Science fiction is a genre of fiction dealing with imaginary but more or less plausible content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities...

 novels by American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 author Robert Mayer

Bob Mayer

Robert "Bob" Mayer is an author, writing instructor, and former Green Beret. He has written over 30 titles under his name and his four pen names . Mayer has applied the principles from his training in the special forces to his career as a writer and as a writing instructor...

, under the pseudonym

Pseudonym

A pseudonym is a name that a person assumes for a particular purpose and that differs from his or her original orthonym...

 Robert Doherty.
In the opening book of the series, it is revealed that in the late 1940s, two flying saucers (called "bouncers") and a mile long spacecraft with an interstellar drive were discovered in the remote Nevada

Nevada

Nevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...

 desert, with information that leads to the locations of seven more abandoned flying saucers hidden beneath the frozen tundra of Antarctica.