Firstly this is such an awesome game! And it's free!

However, I seem to run into a glitch/bug/feature. I just went through a 1-level cave with 2 ladders, with Cave-Dwelling Boars, and on the other ladder going out of the cave, I ran into a thief, some crates, and a freshly dug grave.
Then, I go and interact with the thief, and he said something about a bleeding boy etc, and I replied with something like "I should go investigate that grave further". But when I go to the grave, what I get is only a message "You see a freshly dug grave here", or something to that effect. No changes between before talking to the thief and after.
So, is there something I'm missing here? Or is this just an "unfinished quest"?