The Lust series is pretty good. It’s a horror game similar to Amnesia or Penumbra, except you’re infiltrating a sex cult.

…steampowered.com/…/Lust_from_Beyond_Prologue/

…steampowered.com/…/Lust_from_Beyond_Scarlet/

store.steampowered.com/app/…/Lust_for_Darkness/

store.steampowered.com/app/…/Lust_from_Beyond/