From the file's introduction
A hero finds a note and a set of truck keys in his pocket. The note instructs the heroes to locate a particular panel truck and deliver its cargo to a specified location. But where did the note come from, and what’s in the truck?
Distant Signals 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 3rd-Level Characters