"The Senseless" is a short introductory adventure for the Swing role-playing game (conversion notes for the d20 Modern roleplaying game will come as a separate Appendix). The characters run across an abandoned lab where psychological experiments went awry half a century ago. While the adventure does have physical dangers, the crux of the story involves gathering information and sleuthing.
The major antagonists are slightly stronger than beginning or novice characters, so direct confrontation is discouraged. However, they do possess some psychological and physical weaknesses for the characters to exploit.
The adventure takes place in a generic city, about the size of San Francisco, which has a population of 750,000 (according to a 2003 estimate).