In New York City, 1923, the jazz, glitter, and poetic verse of the Harlem Renaissance is in full swing. But Earl Ridley, a veteran of the all-Black 369th U.S. Army Regiment (the Harlem Hellfighters) is still mired in the dark horror of the trenches of 1918 France, especially one terrible apparition that seemed to have come from somewhere other than Earth. When his vet buddies begin to transform into monstrous alien Sibyls, Earl realizes that what he thought were hallucinations were actually real. Earl is brought out of his isolation by Rose, a sex worker from the deep South, who is wounded by her own trauma. Together they learn that the purpose of the alien Sibyls is nothing less than the end of humanity. To heal, Earl will need to form new bonds, and gain the trust of a man he thought was his adversary. With the help of a young immigrant psychic, a vet-turned-musician, and perhaps even the notorious gangster Stephanie St. Clair, Earl and Rose must find a way to destroy the Sibyls–before he becomes one himself.