Mao is an investigator for a government agency but an unofficial organization. After half a year of investigation, she uncovers information about a sex trade. She infiltrates the abandoned factory where the trade takes place. She loses contact with headquarters and her subordinates are taken hostage. She infiltrates again, but is captured by the enemy and raped and drugged. She is tortured with a vibrator and gang-raped. Mao is addicted to drugs and violated both physically and mentally...