At the end of "Glass Spider," Annie Walker went back and forth on one of the most difficult decisions of her life, and then she was shot in the chest by a woman who has been integral in her decision-making for the better part of this season.

Sarah Clarke... you got us again! Maybe everyone and their brother saw this coming - heck, I even mentioned it in my review of the season three premiere because of Clarke's past as dirty 24 agent Nina Myers - but Lena was so good to Annie that I didn't predict it to ever end like this.

A couple shots to the chest?  Sure, Lena came in and took out Simon. That I get, but taking out her own quasi-protégé while she's at it? I was stunned. And I was absolutely devastated. What did she have in that file that she gave to Arthur?!?What other than Annie's love for Simon could be so incriminating?  Unless it's made up information, which will make me hate Lena even more!

If intensive care or a coma is where Annie is heading in the near future, it's a shame, because Piper Perabo was fantastic in "Glass Spider." Before Annie was lit up like a Christmas tree, she made that tough decision to leave everything behind and run away with Simon. Then she changed her mind and decided to head back into the DPD.

Watching her toil with that decision was exhilarating. I know the entire series is about Annie being a spy, but Perabo was so good in those moments that I continued to wonder what the girl was actually going to do. I bought it hook, line and sinker that she truly wanted to get the heck out of dodge and live a whole new life with Simon.

The Annie and Simon dynamic has been great all season long, and it will be missed if the latter is dead from his shots to the chest. It's funny how the guest player is most surely gone while the leading actress is certainly not going to die from what seemed like very similar injuries.

Luckily, we'll probably never lose the Annie and Auggie relationship, which is still just as great. Because she had been keeping her best friend out of the loop on all of the Simon business, this hour was filled with plenty of emotional words, silences, and glances. When he found out that she destroyed the microphone, and simply asked her if she loved Simon, my allergies really started to act up. It was just more powerful stuff from the dynamic duo of Chris Gorham and Perabo.

"Glass Spider" was extremely tense overall. Between the initial mission at Jai's safe house, the meet at the mall and Annie's final rendezvous with Simon, I was on the edge of my seat through the majority of the hour.

That's when Covert Affairs is clicking on all cylinders. When the tension and emotion are both so high that your heart feels like it's going to beat out of your chest... that's great television. I got there tonight. Did you?

Since they still don't know who was behind Jai's murder, Lena went rogue, and Annie may or may not be in both health and professional trouble, there should be plenty to enjoy next week on Covert Affairs. How can we wait seven whole days?

Dan Forcella is a TV Fanatic Staff Writer. Follow him on Twitter.