John Robinson seemed to have it all. A loving wife, two beautiful daughters, and a growing fortune in the 1800s banking industry. That was until a phantom killer slaughtered his family and escaped into the night. Before escaping, John faced his family's killer, but was left with only a distorted memory of who, or what, he saw.

Plagued by nightmares of that horrific night, John abandons everything and embarks on a journey into the American West. He is chasing a mysterious and unknown killer on a quest for revenge. But after a decade of coming up empty, a brain tumor is cutting John's life short. It seems his family's killer may never be brought to justice.

Years before the murder of John Robinson's family, a legendary bounty hunter, known only as The Vaquero, pursued another monster. The infamous wild west serial killer, Wesley Nelson. Though presumed dead in a wild confrontation, Wesley Nelson's trail of mayhem would echo in the Vaquero's life for years to come.

Aided by the ghost (or hallucination) of John's younger brother Jerry, John Robinson and The Vaquero find themselves destined to cross paths and unravel the mystery of a shapeshifting adversary who is stalking the Midwest.

Set in an alternate American history, this fast-paced and brutal novel, The Adversary, blends together genres of horror, science fiction, and the great American Western. It is likely to appeal to fans of Stephen King, Dean Koontz, and fans of true crime.