“Frontier” by Peter Watts is a grimdark science fiction series exploring the psychological and physical realities of interstellar travel through a generation ship. The narrative blends hard science, philosophical horror, and bleak character studies, offering a uniquely unsettling and intellectually demanding take on humanity’s expansion into the void. It’s distinguished by its uncompromising realism and focus on the dark side of human nature confronting extreme isolation and existential dread.