Olivia Kidney has been through a lot. Being able to communicate with ghosts means never a dull moment- or a normal life. But just when things have calmed down, Olivia's father insists she enroll at one of the most prestigious arts schools in Manhattan! Yet her school problems take a backseat when Olivia must help her friend Frannie solve an age-old mystery, one that forces her deep underground into the infamous, intricate subway system of New York City. And what awaits her makes ghosts look like child's play.