Officer Bob Carson, a rookie police officer in a small California town, discovers a young woman's body minutes after her murder, and he might have seen the truck involved in the incident. The case becomes an obsession, with Bob wondering if he could have prevented the brutal crime. He follows clues wherever he can find them, even as he advances his career with other police agencies.

When a similar case happens in California, as well as others around the country, Bob identifies a suspect - a long-haul trucker. As he closes in, the suspect vanishes and another trucker similar in appearance is murdered. Bob knows this cannot be a coincidence. The trail leads to a showdown on a rainy day in Portland, Oregon. But can Bob bring the cold-blooded killer to justice and wrap up the case that has haunted him for years?