Set in the 1880s, the story follows Ovid Vesper, a former Union soldier who has been having enigmatic visions after surviving one of the Civil War's most gruesome battles, the Battle of Antietam. As he travels across the country following those visions, he finds himself in stranger and increasingly more dangerous encounters with other worlds hidden in the spaces of his own mind, not to mention the dangers of the Wild West.

Ovid brings his steady calm and compassion as he helps the people of a broken country, rapidly changing but, like himself, still reeling and wounded from the war. He assists with matters of all sorts, from odd jobs around the house, to guiding children back to their own universe, to hunting down unnatural creatures that stalk the night -- all the while seeking his own personal resolution and peace from his visions.

Ovid's epic journey across the American West with a surprising cast of characters blends elements of the classic Western with historical fantasy in a way like no other.