Let the ghosts speak, but will the sane heed their counsel? In 19th-century Paris, Justin Trotter, an immigrant from England, is making his way as a book translator while paying for his blind twin sister's care. One evening, Marc Noël, Justin's well-to-do friend and fellow thespian, invites him to a masquerade party at an abandoned schoolhouse. Justin hopes this will be an opportunity to get to know Marc's lovely though sharp-tongued sister Francine. At the event, Justin meets four ghostly strangers - two adults and two children - who warn him that the party guests are in danger, and they must leave at once. True to their prediction, a murder takes place, and Justin is the prime suspect. He escapes and becomes a fugitive, hiding in the Paris catacombs. Mystery and intrigue swirl as the ghost of Joan of Arc and other martyrs guide Justin on a lonely journey to prove his innocence and protect his sister from an abusive caretaker. Who really committed the crime? Marc? Francine? A ghost? And does seeing these ghosts mean he is going insane? Maybe, he really is the murderer, after all. There is only one way to find out: to let the ghosts speak as they reveal the mysteries within Justin's min