Characters are called to a local cliff. Its height doesn't really matter, as long as it's a fairly vertical drop and almost certainly fatal.
A body lies at the base of the cliff, in a relatively inaccessible area.
At the top of the cliff, right on the ledge looking over the body, is a circle marked into the ground. Its purpose is uncertain, but footprints clearly show the corpse at the bottom was standing in it before he walked off the edge. In reality, the circle is the number 0. As the characters stand near the 0, either to investigate it or to observe the body, they are unknowingly photographed. This could be an automatic camera or the murderer, made invisible. The shot will bear a passing resemblance to the classic Rider-Waite image of "
The Fool." This photo will be mailed to them sometime during the next week with the note "Fools." They'll probably be a little creeped out by being photographed without their knowledge, but will probably pass the "fool" comment off as an idle boast.
To the murderer, whom I will refer to as Trump, the characters identities aren't important: he will teach his "lesson" to those who show up to the crime scene, no matter who, and will continue until the Fool's Journey is complete roughly six months from now.
The best way to access the body, at least initially, is for someone to rappel down the cliff. Hopefully one of the characters will volunteer. As they proceed down, they will pass words which have been carved into the rock face:
Inexperience
Irresponsibility
Immaturity
Innocence
The body is nothing special, although the set-up works better if it's someone the characters are at least passably familiar with. It's mostly the red herring to draw the characters to the scene.