The setting of the story is about that any human being might be controlled/possessed at any time by unknown forces. Society as a whole seems to have adapted, there are even laws governing such incidents. Nevertheless, life is quite gruesome. I remember one scene in which it is described that people are killed by jumping to their deaths (into oversized meat grinders? I am not quite sure) while possessed.
The protagonist is a man who raped or molested a woman while possessed. Nobody believes him though, since such a thing never happened before. Although innocent, he is found guilty and becomes a "Liar" mark, maybe as tattoo or branding.
After some adventures he discovers that the possessions are in fact a technical feat by some group (or whatever).