Marooned in Realtime

This novel by Vernor Vinge is one of the most imaginative I’ve read. It easily compares with the works of the old masters of scifi. Ostensibly a murder mystery, it’s also about the last two hundred or so human beings left on earth, thousands of years in the future–to the extent that they stay on earth when not "bobbling" forward through time. Their travels caused them to miss what they call the Great Extincton of humanity and they don’t know what caused it. Now they must figure out how to start over again, if only at a nineteenth century level.