Signal 30, the police designation for crime scene with extreme or imminent emergency, is a riveting mystery about the intricacies of a major crime investigation filled with the terror of unpredictable and insane serial bomber.

In a quiet suburb of New Jersey, a 12-year-old-girl returns from Christmas vacation and finds an unopened gift at her front door. In the excitement and exuberance of a young child, she opens it. The early evening is shattered as the gift explodes and begins a tangled search for the person who would send this destructive present. Suddenly, other devises show up at a shopping mall in New Jersey, the Holland Tunnel in New York, and the home of the Mayor in a nearby town.

Detective Shane Murphy, senior officer with Special Case Investigations, is thrown into the maze of confusion as he attempts to sort out the facts before the perpetrator strikes again. While his personal life crumbles around him, as his wife informs him of her decision to pursue a divorce, Murphy finds assistance with the arrival of Stacy Landou, a Special Agent with Alcohol, Tobacco and Firearms. The case becomes more complicated when the local press begins to hound Murphy and suggests he is failing in his investigation. With Shane's career, marriage, and reputation seemingly out of control, the bomber continues to move one-step ahead of the investigation.