"The Constant Rider Omnibus" by Kate Lopresti, published by Microcosm Publishing, is a collection bringing together multiple stories or possibly a single, lengthy narrative, likely focusing on a recurring theme or character - "the constant rider." Without knowing the specific contents of the omnibus, we can only speculate on the genre. It could be fantasy, science fiction, historical fiction, or even contemporary fiction, depending on the overarching story. The "omnibus" format suggests a substantial volume collecting previously published material or a new, large-scale work.