Some of the most influential novels of recent years, by Rachel Cusk and Karl Ove Knausgaard, take the method of self-conscious first-person testimony to a new level. Their more extreme admirers will tell you that imagination and invention are outmoded contrivances; that to inhabit the subjectivity of a character unlike the author is an act of appropriation, even colonialism; that the only authentic and politically defensible mode of narrative is autobiography.