"Black Friday" is a thriller novel written by Michael Sears. The story revolves around Jason Stafford, a former Wall Street trader who served time in prison for securities fraud. Upon his release, he finds work as an investigator for a brokerage firm. When a colleague's teenage son dies under mysterious circumstances, Stafford is drawn into a complex web of financial schemes, fraud, and murder. As he delves deeper into the investigation, Stafford uncovers shocking revelations about the dark underbelly of Wall Street and the lengths some people will go to protect their interests. Along the way, he must navigate dangerous alliances and confront his own past demons. The novel is praised for its intricate plot, well-developed characters, and gripping suspense. It offers a compelling glimpse into the world of high finance and the moral ambiguity that often accompanies it.