Adopting a child is for many people the culmination of a dream. But it takes work, and money – international adoptions can run from $15,000 to $40,000, and involve years of vetting and paperwork. Still, things don’t always work out. A network of internet groups has become an underground market for advertising and discarding unwanted children – most of them adopted from abroad. The process is called “private re-homing,” and it involves little or no government oversight. It’s the topic of an 18-month investigation by Reuters. Megan Twohey is investigative reporter at Thomson Reuters, and among those who worked on the 5-part series and multimedia presentation called, “The Child Exchange.”