From the file's introduction
A garbled, static-filled transmission in a foreign language emanates from a car radio’s speakers and tells the heroes to stop an actress from reaching the location of her movie shoot. But where does this transmission come from, and why can’t anyone else hear it?
Dire Wavelengths is an adventure that finds the heroes, wherever they may be. It is best used as a brief interlude between regular adventures in the campaign. The scenario outlines a task and describes those who oppose its completion. In addition, information is given about what “punishments” are levied against heroes who elect not to undertake the task at all.
A Short d20 Modern Adventure for Four 4th-Level Characters