"From the widely acclaimed author of The Gone-Away World and Tigerman, a virtuosic new novel and his most ambitious book yet--equal parts dark comedy, gripping detective story, and mind-bending philosophical puzzle--set in a not-too-distant-future, high-tech surveillance state. In the world of Gnomon, citizens are ceaselessly observed and democracy has reached a pinnacle of "transparency." When suspected dissident Diana Hunter dies in government custody...