Ian McKnight thought he had left the horrors of war behind when he returned from the trenches of World War I. But his peaceful existence is shattered when Madeline Shaw, a brilliant cryptologist from Bletchley Park, arrives at his doorstep with a set of ancient parchments too compelling to dismiss. As a medieval scholar and linguistics expert, McKnight soon discovers that he alone holds the key to unlocking the secrets hidden within the 700-year-old texts.

What begins as an intriguing academic challenge swiftly turns into a high-stakes mission, forcing the unlikely duo from the shadowy corridors of a medieval castle in the Scottish Highlands to the war-torn streets of London. Pursued by relentless Nazi agents determined to seize the parchments and eliminate them, McKnight and Shaw must rely on their ingenuity—and each other—if they hope to survive the escalating dangers.

With each discovery, the parchments reveal long-buried secrets that point to a revelation powerful enough to change the course of the war. But to survive—and fully unravel The Loch Ness Enigma—McKnight and Shaw must face not only the mystery hidden within the ancient texts but also the dark pasts they've both struggled to leave behind.