Savannah's friend Tamara Grimaldi was fourteen when her mom was murdered, and the body dumped along the side of Interstate 65 in Indiana. Since then, Grimaldi has kept an eye out for her mother's killer, first as a homicide detective in Nashville, and now as the chief of police for the city of Columbia, Tennessee, a few miles off I-65.

When a new body with the old MO shows up along I-65 in Maury County, it looks like there might be a break in the case. But trying to find a serial killer who has been active for two decades, along an interstate that stretches from the Gulf of Mexico to the Great Lakes, is easier said than done.

Even though this time, there are indications that the culprit might be found closer to home...