The Last Defender of Camelot by Roger Zelazny is a collection of some of his best short stories and novellas. Horseman! is one of the short stories included in the 1980 edition. Horseman! presents a gripping tale of a young man who becomes embroiled in a battle between ancient gods and modernity, exploring themes of destiny, power, and the struggle for identity.

Organized crime magnate Angelo Di Negri is a man out of time and place. He'd been gunned down more than a century ago. But through the wonders of cryogenic storage his body had been preserved until such a time as his "family" had need of him and he could be safely revived. That time had arrived. But Angela discovered that not everything was as it seemed and that the fate of mankind would be determined by his success or by his failure.

In a world half of light, half of darkness, where science and magic strive for dominance, there dwells a magical being who is friendly with neither side. Jack, of the realm of shadows, is a thief who is unjustly punished. So he embarks on a vendetta.

Fred Cassidy leads an idyllic life. As long as he remains a full time college student without a degree, he is provided a very generous stipend from his uncle's estate. But after thirteen years of happy undergrad existence everything is about to change. Cassidy's home is broken into and ransacked. When he enters he is assaulted by a former professor wanting to know where the alien artifact known as the star stone is. Cassidy manages to escape, only to discover that he is also being pursued by hired criminals, Anglophile zealots, government agents, and aliens.

In the darkest part of the solar system lies a wormhole. Nether. Astrophysicist Cammie Skoura has joined the first research team traveling to the Nether anomaly, eager to understand the mechanics of the wormhole and to explore its possibilities as a shortcut to Alpha Centauri. But another race of ancient beings has already been here—an impossibly long time ago—leaving remnants of their vast complexes and gigantic temples built for horrific beings beyond comprehension.