At first glance, Natalie Cavanaugh and Glenn Abbott hardly look like sisters. Even off-duty, Natalie dresses like a Boston cop, preferring practical clothes and unfussy, pinned-up hair. Her younger sister, Glenn, seems tailor-made for the spotlight, from her signature red mane to her camera-ready smile. When a dead body is found in an abandoned building, Natalie starts to wonder how much Glenn really knows about the people closest to her. But are there also secrets Natalie has yet to uncover about those she herself trusts?