Rachel Kushner’s novels are the product of enormous research, but she rarely shows her work; history and creation knot together like threads in a tapestry. Her voice is always authoritative, direct, and knowledgeable, so that even the fictions she creates have the certainty of fact. This talent for verisimilitude shapes The Mars Room. Kushner has described how she worked on the novel by spending time in prisons meeting inmates and “covertly” following criminology students as they toured the facilities. The amount of detail she presents here, some amassed and some imagined, is astonishing. I wonder whether inmates or former inmates reading her book will know which is which.