Sherlock Holmes - The Shadow of the Dawn. Sherlock Holmes - The Palladium Chronicles, #4

The Shadow of the Dawn has fallen. Six months after the Reckoning that nearly destroyed London, Sherlock Vance and Dr. Elias Thorne believe the Palladium Order is finally defeated. The Void has been transformed, the Guild of the Silent dismantled, and the Ghost merged with Gerald Vance's consciousness. A fragile peace has settled over the city. But the darkness never truly sleeps. When former members of the Palladium Order begin to vanish across Europe-each disappearance marked by a single white feather, the symbol of the Vigil of the Eternal Flame-Vance and Thorne are drawn into a conspiracy that predates the Order itself.
The trail leads from Vienna to Prague to Paris, through hidden chambers and subterranean labyrinths sealed for centuries. What they discover is more terrifying than anything they have faced before: a darker consciousness, sealed away by the original founders, has been released. The Archivist, the Shadow Keeper, Lord Percival Blackwood-all were merely pawns in a game that has been unfolding for millennia.
The true enemy is something far more ancient, far more patient, and far more dangerous. The cycle of light and dark is about to begin again. And at the center of it all stands Sherlock Vance-a man who has merged with the Void, who carries the fears and desires of all humanity within him, and who must now make an impossible choice. Will he become the new Lazarus, leader of a reformed Palladium Order dedicated to protecting humanity from the shadows? Or will he find another way to restore the balance?The game is afoot.
The stakes have never been higher. And the Shadow of the Dawn is only the beginning. Praise for Yasin Günes's The Palladium Chronicles:"Brilliantly crafted, relentlessly suspenseful, and utterly immersive. A must-read for fans of Sherlock Holmes and Dan Brown alike." - The Victorian Review"A masterwork of historical mystery and occult conspiracy. Günes weaves codes, ciphers, and ancient secrets into a narrative that will keep you turning pages until dawn." - Historical Fiction Quarterly