"Earth in Peril" is an exciting science fiction book written by famous authors Orson Scott Card and Aaron Yost. The book tells about a threat that comes from the depths of space to the planet Earth. Another civilized species of entities shows evil bent on destroying humanity for their own purposes. The main characters have to compete to save the world from this danger, and they engage in intense battles and incredible events. "Earth in Peril" is an exciting rise of tension, where the fate of the planet depends on the rescued demi-humans.