So I got Dancing with Eternity, by Sniper voice actor and Ellen McLain's husband (something Lowrie)
Basic plot: In the 4Xth century, multi-star system-spanning humanity revolves around two technologies - the "reboot", an expensive procedure that de-ages an elder human to young adulthood, and the "net", which connects nearly every human being on the universe with no lag and allows for a strange social-powered FTL travel. The obligatory burned-out old hand, mysterious rich dame, burly dude, funny engineer guy, plucky engineer chick and mysterious past young lady must explore the cosmos for... well, what they're looking for is cleared about 90% through the book.
The book is very much a first-time effort (oh god so much exposition) and I found two misused "you're"s, so take note. It's also very much an "old writer" book (lowrie is over 50, I understand) in its reflections about loss, success, and etc. It's not really a book about the unknowables of space, it's more about the good, bad, horrible and desperate things humans have always done to humans and will contine doing upon the end of time.