Knocking on Heaven's Door

"On a hotter and more volatile earth in the twenty-third century, humans like Clare and Jon live in utopia, hunting and gathering in small tribal bands, engaged in daily art and ritual, reunited with old friends like the shaggy mammoth and giant ground sloth... It's too bad that utopia had to come at such a cost: a genetically engineered super-virus that wiped out most of earth's human population. Humanity was shaken by that event, and humanity vowed to change. Now, on the 150th anniversary of that catastrophe, a small group of men and women as well as a smarter-than-average dire wolf and saber-toothed cat are suddenly faced with decisions in which the stakes are higher than ever before"--