A novel based on a true story. A mysterious fog drifts into a crime-ridden, poverty-filled section of London. The fog hovers and moves about seemingly at will. Panic runs through the city as people begin to suffer horrific deaths. The Metropolitan Police and Scotland Yard try to work the many cases, but are baffled and unable to solve the crimes. Desperate, the police enlist a trio of former army officers to see if they can find the solution to the puzzle. The fog watches; it waits. It lives while people die.