Murder strikes close to home for a new K-9 unit in Brooklyn. When a double homicide is strikingly familiar to a twenty-year-old cold case, Detective Nate Slater is rattled by the parallels. With a child as the only witness, he and his K-9 partner must protect little Lucy and her aunt, Willow Emery. Nate's rough past means he always keeps an emotional distance ... but in this case getting closer is the only way they'll all survive.