When PI Michael Kelly is hired by an ex-flame to tail her abusive husband, he expects trouble of a domestic rather than a historical nature. Life, however, is not so simple. The tail leads Kelly to an old house on Chicago's North Side. Inside it, the private investigator finds a body and, perhaps, the answer to one of Chicago's most enduring mysteries: who started the Great Chicago Fire and why. The ensuing investigation takes Kelly to places he'd rather not go, specifically, City Hall's fifth floor, where the mayor is feeling the heat and looking to play for keeps. Ultimately, Kelly finds himself in a world where nothing is quite what it seems, face-to-face with a killer bent on rewriting history and staring down demons from a past he never knew he had.