To recover from a cataclysmic war, the Harvest was created to pass blood to those affected by radiation. But this charitable act has led to a society segregated entirely by blood type. Patriot thanks and rewards your generous gift based on the compatibility of your donation, meaning that whoever can give to the most, gets the most back. While working as a reaper for the draw, Willa chances upon an idea to resurrect an obsolete collection technique that could rebalance the city. But in her quest to put this in motion, she instead uncovers a secret that threatens her entire foundations....