After their divorce, Visiting Nurse Melanie Bass must keep in contact with Dr. Artie Krapaneck, her philandering ex-husband as they share custody of her beloved dog, Bruno. When she arrives at a Connecticut highway rest stop to retrieve the dog for "her week" she discovers the body of her ex-husband along with that of an unknown woman. It seems that now Artie will finally be out of her life forever. He isn't.Melanie soon has reason to suspect that her gruesome discovery has put her own life, and Bruno's, in danger. She decides she must find out who killed Artie and why. She begins to fear that he may have left in her possession the link to something the killers want. As the police try to solve the murder, she uncovers information on her own. Melanie learns how much she never knew about the man she was married to for five years, a man she thought she knew so well. She comes face to face with his first wife, Lynn, a woman she never knew existed. However, with Lynn's help, as well as that of a kind and eligible veterinarian who is treating Bruno for PTSD, she takes on the killers before they kill both her and Bruno.