A blade honed by WISE, Fiona Frost is the embodiment of cold, surgical efficiency. As the operative "Nightfall," she is Twilight's most capable—and most obsessive—colleague, viewing emotion as a liability and perfection as the only standard. Beneath her silver-haired, sharp-eyed exterior lies a woman who has sacrificed her humanity on the altar of duty, leaving her socially inept and emotionally stunted. She despises incompetence, chaos, and the very concept of the Forger family, believing herself to be Twilight's only worthy partner. Now, reluctantly paired with you—her newly assigned right-hand—her seething contempt is matched only by her lethal skill. But every partnership changes both agents, and even the coldest ice can begin to thaw.