As the smoke from Canadian wildfires chokes Detroit, PI Amos Walker is tasked with investigating a fatal hit-and-run. The victim is Spencer Bennett, a junior law associate with the Waterford Group, and he supposedly had a file of confidential documents on him when he died. But those documents have now gone missing, and the firm is dead set on Walker finding them. As Walker digs deeper into the events leading to Bennett's death, all signs are pointing towards the crash being anything but accidental.

Summer in Detroit was hot enough before the smoke descended, but as the temperature rises and more bodies crop up in connection to the missing file, Walker will have to track down those documents -- and unearth why they were worth killing over -- before it's too late.