In November, the io9 Book Club is reading Neptune's Brood, by Charles Stross. We'll meet December 2 to discuss it, and we hope Stross will join us later that week for a chat!
Neptune's Brood is a sequel to Saturn's Children, but you don't need to read the first book to appreciate the second. (Here's our review of Saturn's Children and our review of Neptune's Brood.) This book is also one giant hat-tip to David Graeber's book Debt: The First 5,000 Years, so if you really want to do your homework, check that one out!