Note distributed at disreputable taverns in the Niederhafen Bezirk
There are many ways to kick-start an adventure. Not everything have to involve lost artifacts, kidnapped noblemen or nefarious cultists out to destroy the Old World as we know it. Even the most unlikely patrons might want adventurers to go out and slay beasts and creatures of myth.
Of course, how do they know that you've been all the way to the World's Edge Mountains to slay a griffon, and how do they know that the bloodied thing in your bag is really the liver from a jabberwock? Well, if they have the money to send people out on strange adventures, they probably have the means to tell a fake heart of a deamon from a real one ...