Invasion of the saucer people, kind of

While conducting a seismic survey in the Sahara, Rip Cantrell makes a startling discovery, a flying saucer. Rip and his girlfriend Charlotte Pine do all they can to protect the saucer from profit seekers who try to steal the saucer for their own gain. Follow their adventure in Stephen Coonts' Saucer. Our heroes return in the sequel Saucer: the Conquest.