Premise: The Third Option is Vince Flynn's third novel, and the 2nd to feature Mitch Rapp, an American agent that works for the CIA as an operative for a covert counterterrorism unit called the "Orion Team". The first in the Mitch Rapp series American Assassin, was written later, but was a prologue to Kill Shot.
Hypothesis: Mitch Rapp appeared in more than 1 book