Pbartender
First Post
Philomath said:All you need is an indication that the minion was following somebody's orders. An unsigned letter. An NPC to remark that the minion lacked the creativity to concoct the now foiled scheme on his own. The foiled scheme being covered up or cleaned up by an unknown agent.
It could be as simple as a slip of paper with a location and date on it... Obviously, someone told the assassin when and where the PCs would be. That should be enough to pique their curiosity that a BBEG exists, but not so much that his identity is readily apparent and they charge off after him before they're ready.