It’s Moraleses vs. monsters as the Ultimatum saga reaches its chaotic conclusion! Miles is taking on his biggest responsibility yet: babysitting his new little sister, Billie! But fussiness and feeding time are the least of their problems, because there’s something horrific stirring underground! Meanwhile, Miles’ uncle Aaron has made a deal with a different kind of monster — the villainous Ultimatum — and he’s about to get bitten! And to make things worse, when the government outlaws teenage sup ...