And book two was...

2010: Odyssey Two  - Arthur C. Clarke

...Fabulous! I like this book sooooo much better than the first. The people actually make the story here. A few years ago I read Larry Niven's Ringworld and discovered I don't care much for extreme hard sci-fi. Books where the science drives the story and not the people. That was one of the problems with the first book. Fortunately that isn't the case here. While I enjoyed the descriptions of the various space items it was because that forwarded the plot. It was startling to realize that the time frame of this book is concurrent with the last few chapters of the first book. People tend to think that sequels must perforce take place completely after the events in the first story. And I will be most interested to see how humanity copes with two suns, no nights and an eventual encounter with the Europans.