Tipping Point

Originally, MI-6 expected to use the Oliver estate as a conference center and safe house. But, it will now be used for debriefings, detaining prisoners for indefinite periods of time, and a kind of 'finishing school' for spies.

Sarah has an apartment on the third floor -- to both remove her from the path of an ex-boyfriend, to be company for her aunt -- who is not particularly convinced of their newest assignment.

The 9/11 attacks are the final straw for Jack Lloyd, already disheartened by how the US has ignored the information Beth provided the summer before. He resigns, and moves to England.

Sir Roger is brought on board to help with the MI-6 candidates, because they feel there's a mole in the group.

And, Beth is trying a new debriefing technique on their first guest -- a high level terrorist.
Things seem to be going along nicely, until one of the candidates end up dead.