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When you think you're safe, When you think you're all alone, That's when he'll come for you... A silent killer stalks the city, targeting those home alone at night, playing a deadly game of cat and mouse with the victims. As panic spreads, Detective Inspector Helen Grace leads the investigation, but is herself a hunted woman, her every step shadowed by a ruthless psychopath bent on revenge. As she tracks the murderer, Grace begins to suspect there is a truly shocking home truth that connects these brutal crimes. But what she will find is something more twisted than she could ever suspect... Check the windows, lock the doors - this is a twisted page-turner that will prey on your darkest fears, in the way only M.J. Arlidge can.