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Cassian Noor, a Coast City crisis negotiator trained to stop people in the final seconds before disaster, is shattered after a police shooting proves that one choice can define a life forever. When a STAR Labs experiment called the Mercy Engine goes wrong, Cassian gains the ability to see and manifest the choices people almost made — the violence they nearly committed, the confessions they nearly gave, the mercy they nearly chose. As he becomes the masked figure known as Afterimage, Cassian is pulled into a conspiracy involving Dead Letter, The White Minute, Morrowglass, Null Saint, and the ruthless corporate visionary Aurelia Quell, forcing him to confront whether people should be judged by what they did, or by what they almost became.