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April 1945. As the Third Reich crumbles, a covert Allied team is sent deep into the Thuringian mountains on a mission that doesn’t officially exist. Their orders: infiltrate a medieval castle seized by the SS and recover a relic hidden within its ancient vaults — an artefact whispered to defy reason. Captain Arthur King, a soldier turned investigator, leads a handful of specialists into the heart of the fortress. With him is Maggie Clarke, a young codebreaker whose wartime brilliance has drawn her into a world far darker than cipher rooms and typewriters. What begins as a desperate race against time becomes something else entirely — a confrontation with forces buried beneath centuries of war, myth, and secrecy. In the final days of the Second World War, they will uncover that not all of history’s monsters are human.