Railroad detective, Trade Morgan, goes through a midlife crises when his wife divorces him and takes his children to Florida. His employer, Consolidated Southern Railroad, has assigned him to the four-hundred mile area between Las Vegas-Barstow and Needles, known as the "Devil's Triangle." Included in his assigned area is the world famous Cajon Pass, known for its rail grades, design and dangers. After a series of sniper attacks and derailments in the "Devil's Triangle," a secrete train transporting the Army's poison gas to their desert military depot is derailed. The poison gas released in the crash kills many civilians. The Army, FBI, and railroad executives are pressured by the national news media to bring the perpetrators to justice. When the saboteurs kidnap a railroad executive's widow, who Morgan has more than a friendly affection for, the FBI assigns Agent Devera Delaney, an old flame of Morgan's, to help solve the case, adding to his distress. Morgan's life is turned upside down dealing with the women in his life and the attacks on the railroad. As pressure mounts, Morgan and Delaney's personal conflicts exacerbate and their jobs are on the line if they don't solve the cases. In a thrilling chase to the end, they match wits with those responsible and pursue them on the rails from Needles to Cajon Pass, ending in a deadly conclusion.