September, 1940

A thick fog clings to the coast of Halesea, a village paralysed by fear of a German invasion. War Reserve Constable and traumatised WWI veteran Wilfred "Wilf" Moss is called to a brutal scene on Easterly Beach: a fishing boat has run aground and three Home Guard volunteers lie dead, including his oldest friend. While survivors claim they intercepted a Nazi vanguard, an immaculate Whitehall bureaucrat, Charles Cavendish, arrives to enforce a strict cover-up.

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Shut out but suspicious, Wilf launches a shadow investigation through the mist. He quickly realises the "heroic skirmish" is a lie, and that a surviving guardsman hides a terrifying secret. As Wilf uncovers a dark, state-sanctioned conspiracy, he tracks down a sole survivor hiding in the coastal wilds. Forced into a deadly standoff, Wilf must risk everything to outmanoeuvre his own government and protect a witness from being erased.