An unprecedented series of violent tornadoes is sweeping across Oklahoma. Tornado chasers, headed by Dr. Jo Harding, attempt to release a groundbreaking device that will allow them to track them and create a more advanced warning system. They are joined by Jo's soon to be ex-husband Bill, a former tornado chaser himself, and his girlfriend Melissa.
After the murder of a police inspector, his widow discovers with horror that, in addition, her only daughter has been kidnapped. While driving in her search, the voice of the technical roadside assistance that comes through the intercom installed in her vehicle, reports that he is who has kidnapped the girl.
In 1973, 7-year-old Steven Stayner is kidnapped by pedophile Kenneth Parnell. Under the belief that Parnell has been given legal custody of him, and that his family has moved away, he stays with Parnell for seven years, enduring repetitive sexual abuse the entire time. Finally, in 1980, when Parnell kidnaps another young boy, Steven finds a way for them both to escape and return home.
