A portrait of Jim Pickens can bee seen at the middle of the brain washing device
Your sims will then arrive at the forgotten grotto cave and the kidnapped sim will be added to your household (If you don't have 8 sims already in your household).A sim selector screen will show up showing the sim that you can kidnap, click on their portrait.
To kidnap a sim click on them -> Life Tragedies -> Kidnap Sim To Cave.You can now kidnap other sims (Teens - Elders) for a ransom, or to keep them in your household as a kidnapped sim