Four misstresses who come to the slave market to trade goods, each for free, even if the test torment is to die. They take their favorite slaves out of prison and torture them to the extreme. The slaves are discarded if their owners are not found, and they desperately need to endure the hellish torture of Mistress. The slaves are gradually assaulted in groups of two, then four, and gradually the slaves are beaten to a pulp. Who will be picked up among the crying slaves?