A few non-criminal Biker chicks and/or punkish girls have an unfortunate run in with a gang that is violent and criminal. Looking for the "baddies" Het or Femme.
Edit to add an idea: Your character inherits a house from a distant relative. Going to check it out they find a hidden entrance to secret basement and the half starved slave girls inside. Well they were part of "the house and everything in it".