If you are into these kinds of mysteries, I highly recommend reading Pandora's Star by Peter F Hamilton. (even more so if you want to spend a few days reading this epic space opera)
However, I absolutely love the Night's Dawn Trilogy and re-read it once every few years. I think I read it at an impressionable age and it really stuck.
One could also consider reading Charles Stross' "Accelerando" which has plenty of stuff about dyson swarms.
For more Peter F Hamilton optimistic future of humanity, see the Night's Dawn trilogy.