Jack questioned Audrey. Prior, Cloe informed him that Audrey stayed at a hotel with the White House guy who hung himself (forget name). Audrey lied about how well she knew him...Walt Cummings...that's his name! Audrey convinced Jack that she wasn't involved and he wanted them to release her but the White House woman insisted on pushing her a little more so they sent in the torture guy who injects you with stuff that seems to make you unhappy. Meanwhile, Jack was able to pull more information out of the detained foreign chic. She admitted to being advised to use Audrey's name if she was arrested to mess with Jacks head. They injected Audrey with one torture shot before Jack was able to get her released. Slight romantic gag scene!
Meanwhile, the nerve gas was about to be released into a gas plant so that it would be directly pumped into peoples homes. Jack made it just as it was released so the only option was to blow the plant up so that it could not travel through the pipe lines. That is how it ended. We are supposed to be wondering if Jack made it or not. I have a hunch that he did.