These four books form the basis for all the books that follow. There are many mysteries, but the books also include character development and the growth of Colton Banyon’s unique team.A Dubious Terrain #4 – The illegal alien issue has gotten out of hand. A major plot to use them as pawns to achieve political goals is uncovered by Colton Banyon. It involves drugs, riots, political assassinations, and the fight game in Las Vegas. A new member is also added to the team.A Dubious Plan #5 –An old German World War II plane is discovered in Death Valley. It leads to a plot that goes back to the end of the war and involves current-day Nazis. It is pure adventure at the highest level.A Dubious Artifact #6 – Banyon discovers that he and Loni have ties that go back to WWII. It almost breaks them apart, but an old artifact from his father must be protected. Not only are the Nazis after it, but so are the Chinese. Some team members will be in jeopardy.A Dubious Position #7 – Banyon takes a job at a prestigious law firm at the request of the President. But it is not any old ordinary law firm. Soon he has to stop a brewing war between the United States and Mexico and uncover who is controlling the plot while attempting to avoid several killers.