It was a great preview into what i believe will be a little more darker castle than what we have seen in the previous 3 seasons. The overall show was mainly about Beckett getting back into the game again after being shot and Castle being there no matter what.
I'm actually quite glad that what we saw at first was that Beckett said she didn't remember what had happened when she was shot. Although I had an inkling there was more to what she said to Castle and I was elated to find out that she did actually lie and she does remember everything. I believe the writers have done the right thing here as there could be more done before Castle and Beckett get together.
Thank god motorcycle boy is gone as he was really starting to annoy me. What I hope now is that the writers don't bring in any more BF/GF for either of them for a long while, doesn't need it.
I think I'm looking forward to a more edgier Castle as we saw near the end. Bring on the next episode.