This is it. This morning I started the twentieth and final (completed) book in O'Brian's Aubrey-Maturin series. There is a 21st, but unfortunately O'Brian passed away before he could get further than the third chapter, so it was published unfinished.
I'm not sure if I'm going to go there. Probably, but I'm not yet certain.
I've really enjoyed the series. As I think I've mentioned before, I found O'Brian's style difficult to connect with at first, but his characters sink their hooks into your psyche, so as the books roll on, they became increasingly all but impossible to put down.
I have no idea what I'm going to read next once I'm done. I feel vaguely panicked by that uncertainty.