On a sunny summer morning, nulls all over the country are attacked at the same time. In Boulder, Allison "Lex" Luther barely gets her niece to safety. In Los Angeles, Scarlett Bernard is nearly shot in the back. It seems that a powerful enemy is unhappy with the Old World leaders' plans to form a government, and they've coordinated a strike against those rare individuals who can undo magic itself. Now Lex, Scarlett, and their trusted friends have a plan to put these attackers on trial... but finding them won't be easy, and stopping them means leaving their own territories behind. The California null and the Boulder boundary witch, along with allies old and new, will have to travel to Galena, Illinois, a small town near the Mississippi River that serves as an annual playground for vampires. To protect nulls and safeguard the future of the Old World, Scarlett and Lex team up to fight a battle that's been years in the making. But Galena has secrets of her own... Old World War is the twelfth and final (for now) book in the Old World series.