Detective Roger Viceroy, divisional head of the Midwest Region Special Crimes Unit, awakes one morning to a bombing in a wealthy suburb of Milwaukee. As he and his team dive into the investigation, a mysterious clue launches a manhunt with scant other evidence to point them in the right direction.

Over the coming weeks, the related murders unfold, each with a unique twist and the same clue left behind. Viceroy uncovers one other common thread - a seemingly random association with the small north woods town of Curwood, Wisconsin.

As the death toll mounts, Viceroy has to connect the dots and stop the carnage before it reaches the final target, Governor Kay Spurgeon.