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As Mulder takes in the words told to him by Michael Kritschgau, that extraterrestrial life is nothing but a hoax, he is contacted by Kritschgau telling him that someone may be watching Mulder's apartment. Later, Mulder arrives at Scully's apartment, informing her that the man who was watching Mulder for someone at the FBI is now dead. The two work around the clock in order to connect the dots to a mole inside the Bureau.
Mulder: In four years I have shared my partner's passionate search for the truth and if my part has been a deception, I have never seen her integrity waver or her honor compromised. But now I ask her to lie to the people lying to us -- a dangerous lie to find the truth -- to find the men who would be revealed at its enemy, as our enemy, as the enemy within.
Scully: Mulder, how long has this been going on?
Mulder: Maybe since the beginning, since you joined me on the X-Files.
Scully: That would mean that for 4 years we've been nothing more than pawns in a game, that it was a lie from the beginning. Mulder, these men... You give them your faith and you're supposed to trust them with your life.
Mulder: There are those who can be trusted. What I need to know is who among them is not. I will not allow this treason to prosper, not if they've done this to you.
Scully: Mulder, we can't go to the Bureau making these accusations.
Mulder: No, but as they lie to us, we can lie to them. A lie to find the truth.