There was never a choice.

For years, Cain served the Order of Saint Obscura, a clandestine sect that operated in the shadows, hunting down what should never exist. They told him he was their weapon, their blade against the darkness. But it was a lie.

Cain was never meant to be a soldier. He was meant to be a key.

When a massacre in a high-rise penthouse leads him to an ancient ritual buried beneath the city, Cain begins to unravel the truth behind his existence. His blood was never his own. His body was never built to fight—but to open. The whispers in the dark, the hunger beneath his skin, the shifting shape of his reflection—it was all leading to this moment. A gate has been waiting to be unlocked, and Cain is the final piece.

But when the time comes to kneel, he refuses.

Now, hunted by zealots, pursued by the Order, and haunted by the monster he was always meant to become, Cain has only one question left:

If he was never meant to survive this—why is he still here?

A brutal, supernatural thriller blending occult horror, dark fantasy, and unrelenting action, The Mouth of the Hollow is a story of fate, rebellion, and the thin, violent line between man and monster.