exploiting a booming market for sure ga si, which has been popularized by celebrities like sarah jessica parker, ricky martin and nicole kidman. but even in this crowded marketplace, the tactics used by the baby ring stood out. we found this ad posted online, guaranteeing a healthy baby but warning of very high expenses. >> when we first heard about this, we found it shocking. >> reporter: this special agent from the fbi worked on the case. >> it's a very minimal check and they are giving babies away to the highest bidder. >> reporter: they needed somebody on the inside to crack this case. >> the fbi gave me a call after i'm dropping my daughter off for school and they asked me where i am and then they tell me they're sitting outside of my home. >> reporter: that's got to be teteifying. what did they say to you? >> they told me that they thought i had been involved in international fraud. the first thing i asked, does the baby exist. and they told me he did. and -- oh, wow. i couldn't really think straight for the next five minutes because i was just slipping out. >> reporter: how scared were y