The Secret Adversary: A daring postwar mystery of secret treaties, phantom masterminds, and amateur sleuths thrust into the heart of a deadly conspiracy.

Two young adventurers. A missing treaty. A ruthless criminal mastermind holding the fate of the British Empire in his hands.

It is 1915, and the torpedoed Lusitania is sinking fast into the icy Atlantic. In the chaos, a desperate man entrusts an oilskin packet of unimaginable political significance to a young American girl named Jane Finn. She survives the wreck, but vanishes without a trace. Five years later, the Great War is over, but a new, more insidious threat is rising. A covert syndic...