"The 12 Apostles are ready to work on the pebbles" This was a clue left by a man who rigged his house full of shotguns. The clue is meant to know where it is. He was shot by one of them and when raided, the house did not yield the final gun. Where was it?

"The 12 Apostles are ready to work on the pebbles" This was a clue left by a man who rigged his house full of shotguns. The clue is meant to know where it is. He was shot by one of them and when raided, the house did not yield the final gun. Where was it?

Answer here