Go home to admire your knife while in your "secret place"

You have a secret place you have to go through a maze inside your cave, fumbling in the dark. At a certain dead end where water gently trickles from the ground above you climb a hole high up in the cave wall and you are in this great dome. The top is open to the sky but you are far below at the bottom of a shaft in the hill above you. You play with the knife. Turning it over and over running your fingers over each detail. You love this knife. But while reveling over your wonderful new item a lump of human shit falls smearing the floor from above. Some bastard above is using the shaft as a toilet! At least you were not hit.

But this is your secret place. And shitting on it can not be tolerated. You must find out who did it and kill this person.