For Henry, a seventeen-year-old who feels no fear, the day starts like any other--homeless and alone on the streets of Boston. For Sarah, a twenty-year-old college dropout, it's an early morning serving donuts and coffee to commuters at North Station. Fate brings them together at the scene of a bank robbery, which they foil together, along with a mysterious and wealthy woman named Helen, who offers to reward them for their bravery. But before they can reach Helen's penthouse, they are assaulted by men and women from all walks of life, including police officers. Helen displays impressive fighting skills, fending off the attacks, allowing Henry and Sarah to make their escape--but they are spotted and pursued by the violent cult, out for Helen's blood...and now theirs. Racing through the streets of Boston, Sarah and Henry are propelled into a strange and ancient underworld where the impossible is real, where the old world still lives, and where the gods still walk among us. As the pair wages war against the killers hunting them, they discover the truth about who their deceased parents were, and that their lives could be far more exceptional than either believed possible...if they can survive the day.