David Kirmani,a medical professional, lives in an apartment with his sweetheart, Erica Bain, a radio host, and his dog. They usually take the dog out for a stroll in nearby Central Park and let him run and fetch. One day while at the park they let the dog run without a leash, and when he does not return or respond to their calls, they frantically search for him. They eventually find him being held by three men who want a reward. When David refuses, they start to molest Erica and David intervenes. Two of the men assault the couple, while the third uses a camcorder to film this incident. Erica is knocked unconscious, and regains her senses several days later in a hospital. She is told the shocking news that David was killed and the dog is missing. A traumatized Erica returns home to try and regain her life. She also visits the police station but does not get much help. Fearful of a repeat of this type of incident, she gets an unlicensed gun and carries it with her all the time. One day ...