Simon Knights was a CTU District/Division intelligence agent who had access to the schematics of Saugus detention center. When Tony Almeida found out that there was a second mole at CTU who had leaked the schematics of the detention facility to the Drazens, he informed Nina Myers of the situation and later showed her a list of people who had access to the archives in the past month. Knights, along with Bob Johnston, Sonja Lindstrom, Mercy Ross, Paul Conti and George Mason, was among the list. Tony quickly ruled out the first five as they were just doing schedule backup, and determined that George Mason, who accessed the files four days ago with no reason, was the mole. Nina then asked Tony to shut down George's network access. Unbeknownst to Tony, Nina was the real mole who used George's a