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Paris bleeds secrets-ancient, ruthless, and buried beneath centuries of lies.
When brilliant but guarded cryptographer Jeon Jungkook receives a frantic midnight call from renowned curator Professor Delacroix, he expects another academic puzzle. Instead, he walks into a nightmare: the professor's body hanging from the ceiling of the Musée de la Nuit, chest carved with the forbidden sigil of a long-dead order-the Oculi Noctis, the Night's Eye.
Moments later, the museum is plunged into darkness.
And Jungkook is no longer alone.
Emerging from the shadows is Kim Taehyung, the magnetic, unreadable man Jungkook once saw as a rival-and something far more dangerous to his heart. Taehyung claims he was summoned, too. But the fury in his eyes says he knows more than he ever lets on.
Soon, the two of them are hunted through the city by a faceless organisation whose influence stretches back to the Renaissance. Every clue they uncover twists into another riddle; every riddle leads to another corpse. And at the heart of it all lies the Saint Varee Codex, a manuscript encrypted with a cipher only Jungkook can solve-and only Taehyung can protect.
Forced into a brittle alliance, Jungkook and Taehyung race across Europe through catacombs, abandoned monasteries, and underground vaults, piecing together a conspiracy entwined with kings, traitors, and a secret so volatile it could rewrite history.
But the deeper they descend into the labyrinth of codes and betrayals, the more Jungkook realises:
The Night's Eye didn't kill Delacroix to guard their secret...
They killed him because of Jungkook.
And Taehyung-enigmatic, calculating, dangerously calm-may be the only one who can keep Jungkook alive.
If he doesn't betray him first.
Dark, atmospheric, and relentlessly thrilling, Shadows of the Cipher launches a saga of murder, ancient ciphers, forbidden history, and a slow-burning tension between two men who trust each other least when they need each other most.