It is indeed a mystery. No one knows for sure how, one winters day in 1972, the grass of Whitworth Park became host to many strange geometrical formations. Nothing is known about these mysterious circles - except that they are circular in shape. And very mysterious.

The only clue is an audio recording that was made by an amateur vulture-spotter on that fateful night - and has caught the sounds of the circles being made.

Is it aliens? Ghosts? Mystic life forces from the underworld? Creatures from a parallel dimension? Theories abound, but I fear we shall never know for sure.