I'm running a mystery adventure for my tabletop rpg group. I want the players to discover that the abandoned car that is thought to have been last driven by its missing owner was in fact driven by someone else. What kind of clues could I provide to lead them to that conclusion?
Here are some clues you could give:
The driver's seat and mirrors could be adjusted differently, hinting to a different anatomy of the driver
The air in the car could be filled with a certain smell hinting to a different person (like an aftershave, if it is a male instead of a female, or a smell associated with a certain working environment like a kitchen, or a fish market)
There could be direct traces, like a lost hair, a shoe print, or hand print, that wouldn’t match the owners physique