The grey mullet is known for its roe, a beloved delicacy in Taiwan. Every year around the winter solstice, schools of grey mullet migrate south to spawn. When the cold current hits Taiwan, so comes the grey mullet. In order to catch the precious ‘black gold’ at dawn, local fishermen set out in the thick mist and follow the mullet in the dark. This documentary focuses on the mullet industry and captures the 300-year-old tradition of mullet fishing.