Timeless by Gail Carriger
Gail Carriger provided just the right amount of chapters after the climaxing moment to neatly tidy the storyline and conclude the narrative without opening any new avenues. She certainly could continue the story onward since all characters are still highly present, but it would be able to be years down the line and completely independent of this wonderful five novel set. I was highly impressed with the succinct wrap up. These have made my re-read list, which I believe will age like a very fine wine.
Here's to picking up several different options to choose the next path!