Having barely escaped the fiendish clutches of vampire vixen Alegria Pérez, teenage hemophiliac, half-vampire Joshua Puig and his high school cohorts grapple to survive the final 24-hour period of life-altering events thrust upon them by the cyclical--and deadly--arrival of the cobalt moon. Joshua and his passive band of half-vampires struggle to stay one step ahead of the revenge-consumed Alegría and the opposing, blood-lusting sect of half-vampires, who require the "Docile" blood strain in order to become full vampires. Intent on fulfilling their humanity-embracing ways, Joshua and his fellow half-vampires flee their home base of Miami in 1968 to a secret hiding locale in northern Florida. But with ulterior designs on facilitating the bloody rite of passage for her son, Raúl, and other "Hostile" half-vampire underlings, Alegría defies the supernatural underworld's highest authority and does everything in her power to hunt down the escaping teens, forcing a final, climactic showdown.