Kyle Craig (a.k.a) the Mastermind is an antagonist in the Alex Cross series and the archenemy of protagonist Alex Cross. The Mastermind is Cross' biggest nemesis and the main villain of the book series.
Craig, a Special Agent for the Federal Bureau of Investigation, is initially a close friend of Cross and assists the detective in his high-profile investigations, and also occasionally asks Cross for help with his own cases. However, in the 2001 novel Roses are Red. Craig is revealed to be a criminal who calls himself "The Mastermind", having organized a series of brutal bank robberies and murders. He is eventually brought to justice by Cross. From Violets Are Blue onwards, Craig has been one of Cross' most formidable adversaries.