A street lamp illuminates the rain-soaked pavement, as sounds emanate from somewhere deep in the night. You are very near to the headquarters of The Green Street Underground, a mystery is afoot, danger lurks at every corner, clues are everywhere and hidden in plain sight. We have created a secret file, all you will need to know is enclosed in the downloaded dossier or, on a green disc, which when revolved at precisely 33 1/3 rpm, the mystery is revealed. We're counting on you to solve this one and become an agent of The Green Street Underground.