In a future where humanity is a refugee species, can refugees from the past save us? The pneumavores ("soul eaters") have taken the earth and have spread to every planet humanity has ever touched. Now a Syrian refugee, a thirteenth-century librarian, and a hijabi shapeshifter from the far future must travel across space and time to defend humanity from this intergalactic and devouring evil. They'll find allies: A wheelchair gunslinger from far-future Beijing. A legion of women soldiers wielding Spinning Saws that can slice through predators that only barely exist inside our universe. A strange child-empath who can hear all of humanity's suffering at every instant in history. A firestarter-goddess from our prehistory. Together, they will face a species that travels across time and feeds on terror itself.