One plot:
Henderson enters the house and starts the weapons dealer that CTU is waiting outside and he needs to back up his computer info so they can make an escape.
Jack and Curtis decide to go in thinking that Henderson played them. The weapons dealer is injured from gunfire. Henderson tells Jack that Jack screwed up his plan to get the weapons dealer to download his important info to a flash drive so that CTU did not have to mess with the dealer's very secure firewall.
Jack is able to send some of the encrypted computer info to Chloe at CTU while an injured Curtis prepares to take the dealer back to CTU.
Chloe informs Jack that she found a file dealing with a Russian attack sub that is stationed at a nearby dock. They believe that this is the new target for Bierko is going for. Jack and Henderson proceed to fly out to the dock on a helicopter.
Next plot:
A beat-up Agent Pierce is asked by President Logan if will be a problem or will he be loyal to the President. Agent Pierce tells him that he will never hide the truth.
After some discussion, President Logan gives one of his loyal agents the duty of disposing of Agent Pierce.
Awhile later, the First Lady is outside smoking a cigarette when she notices a dark sedan approaching a building with just it's park lights on. She goes to investigate.
The vehicle is to be used to transport Agent Pierce out of the retreat. A fight ensues between Agent Pierce and the other agent, and the First Lady shoots the other agent. She saves Agent Pierce.
Another plot:
The captain who's in charge of the Russian sub is notified of the terrorist threat by Jack. He goes to investigate and is shot by Bierko. Bierko releases toxic gas on the sub and kills the crew. He is now in possession of a Russian attack sub with 16 missiles.
I think this covers most of it, or what I remember off the top of my head. :SIB