We get another huge revelation as Tony Almeida, director of the C.T.U., tells the President of the United States to look at something on the computer. The President's brother and adviser, Wayne, logs it in and we see a message from Bauer, saying "If you are looking at this, I have already infiltrated the Salazars and...."
In a nutshell, all of this virus stuff with the kid and the breakout of Ramon Salazar from jail has been "part of an elaborate sting planned and executed by Jack Bauer." We learn that the Ukrainians do indeed have a very deadly virus and Jack has worked to set up a buyer in the Salazars. Jack's plan is to make sure that virus doesn't go anywhere.
The President is not happy he has been deceived through all of this, that only Jack and Tony were in on this, although he certainly can't argue with the ends justifying the means here.
The main thing in this episode is the tension at the Salazar's Mexican home and whether Jack can stay alive with Ramon still (justifiably!) not trusting him and quite happy to blow him away any time.
There are other things in here, too, some dramatic involving Anne, but they are personal sidebars stories and there is no reason to go into everything that is happening in the episode.
Suffice to say it's another tense and entertaining one. I just have complaint, if anyone is reading this: why do some of these characters, beginning with Keifer Sutherland whisper their sentences so often? People don't do that in real life. Is it for dramatic purposes?