When a family of 6 and their 2 dogs went missing from their home in France in April 2011, authorities were stumped. When they checked the house, there was no sign of a disturbance and everything was neat and orderly. Police thought the family had simply gone on vacation. That was until a letter arrived stating they were suddenly in the US federal witness protection program and further communication would be dangerous. Seemed odd to family. When investigators returned to the empty home and scoured for clues, they found a lot more than they expected. What followed became one of the most intriguing and infamous cases in French history. Learn more about your ad choices. Visit megaphone.fm/adchoices