"Dark Before Dawn" is a novel by M. J. Arlidge that follows the story of Detective Helen Grace, a dedicated investigator in Southampton. The plot revolves around a series of mysterious disappearances that lead her to uncover dark secrets and confront her own past. As the investigation unfolds, Helen faces numerous challenges, including a cunning adversary who seems to be always one step ahead. The narrative explores themes of resilience, justice, and the complexities of human nature, making it a gripping read for fans of the thriller genre.