Last night's NCIS: Los Angeles had a twist that I didn't see coming. Did you?

It was obvious from the opening of "Patriot Acts" that Gavin Knowles wasn't the bomber from the look of surprise on his face when he revealed the bomb in his truck. But, the search for the truth was not clear cut at all.

The lack of cooperation from the FBI was disappointing to see, but probably fairly realistic. But, NCIS has withheld information from other agencies in the past as well. Definitely not the best way to keep citizens safe from terrorists. It also provided the perfect opportunity for Nate to return.

Nell's reaction to Nate, though, was surprising. She joined the NCIS boat house crew when Nate left for the Middle East. How did they get close enough to send emails and for her to apologize for not sending a care package?

The return of Nate was a positive, as was Granger's limited involvement. If it continues to only be via Hetty and the phone, that would be nice. The distance made his involvement appropriate and limited his manipulation of the investigation. From afar, Granger isn't so bad. Let's hope it stays that way.

What I didn't understand about the case was why the FBI so quick to blame Knowles and discount that there was a larger plot at play? Were they trying to save face? Prevent fear of another attack in Los Angeles?

On a first watch, I thought they were trying to protect themselves from it getting out that they arrested the wrong man, who was killed in prison. But, the FBI wouldn't have known about that connection since Mia was using an alias.

Instead, it appears that Agent Ambrose cared less about the truth and more about closing the case. He was railroading Knowles, just like he did with Mia's boyfriend, Raffi. Unfortunate, but not something he should die for doing.

And then the twist ... Adam was responsible for not only the bomb in Knowles's truck, but for the one that Raffi was convicted of years before. Adam manipulated Mia and played the FBI. Thankfully, NCIS stuck with the case and followed it through to find the actual perpetrator and Mia finally got justice for Raffi.

Outside of the case, what did you think about Nate exposing Nell's feelings or possible feelings for Eric? Over the last few episodes, I thought it was possible that they were already secretly dating, but that doesn't seem to be the case.

I love the two of them together, as I've mentioned before. I'd much prefer to see Eric and Nell hook up than Deeks and Kensi. Do you want to see either of these two potential NCIS: LA couples together?

Carla Day is a staff writer for TV Fanatic. Follow her on Twitter and on Google+.