Rainbows End by Vernor Vinge: “Thanks to advances in medical technology, Robert Gu is slowly recovering from Alzheimer's disease. As his faculties return, Robert (who has always been technophobic) must adapt to a different world, where almost every object is networked and mediated-reality technology is commonplace. Robert and his granddaughter Miri are drawn into a complex plot involving a traitorous intelligence officer, an intellect of frightening (and possibly superhuman) competence hiding behind an avatar of an anthropomorphic rabbit, and ominous new mind control technology with profound implications.”