In 1985 in Milan Michele Croce is now in prison and decides to answer the magistrate's questions, telling how in the seventies he became the ruler of the Milanese underworld.

Set in Sicily in the 1930's, Aurelio Grimaldi's feature debut chronicles the harsh story of twelve-year-old boy, Aclà, sold into slavery by his destitute parents to work in the underground Floristella sulfur mines. Overworked and underfed, Aclà toils from Monday to Saturday in the steamy, candle-lit labyrinths. Repeatedly beaten and abused by his "owner" and with constant threats of being raped, Aclà plots his escape to the sea...