Several themes recur throughout the works of American science fiction and fantasy author C. J. Cherryh. Cherryh's protagonists often attempt to uphold existing social institutions and norms in the service of the greater good while the antagonists often attempt to exploit, subvert or radically alter the predominant social order for selfish gain. Even when they have conflicting loyalties, her characters do not behave randomly or inexplicably, but for reasons well-rooted in their personality, biology, and culture. A number of Cherryh's novels focus on military and political themes, and on ways in which individuals interact with The Other.