It's three years since the end of World War II. The only winner was the "Blood Death", a plague hatched in Hitler's labs and sent across the Channel. Now, London is in ruins, roamed by a few mysteriously immune AB-negative survivors. Among these is Hoke, an American and four other AB-negs--a Lady, a factory girl, an air-raid warden and an escaped German POW. Now this group will band together in a perilous battle in the bowels of the Underground against those survivors hungry for their blood.