In 1916, the market for stolen antiquities is booming. When Jack Meade, an American oilman and antiquarian, buys an unsorted collection of old maps, he discovers a priceless Viking-era map hidden in the crate. The royal seal on the map is that of King Baldwin who claimed it for his collection during the Eleventh Century. The fabled Baldwin Portolano has an Old English riddle on it which points to the location of a multi-million dollar treasure hoard. Hidden in the riddle is a both a missing part of England's history and a threat to its future. If the German agents on Meade's trail get the map and decode it it first, the treasure could fund Germany's military advantage. British Intelligence dispatches a shell-shocked linguistic scholar from the trenches of France and a female physician, who is also an amateur archeologist, to assist Meade. The three must outrun Germany's top Secret Agent, outwit the ancient riddle-maker, and conquer their inner demons if England is to have its treasure, its history, and peace.