For over six years, Stéphane Breitwieser, an ordinary Frenchman with an extraordinary love of art, trolled museums and private collections across Europe, helping himself to the pieces that caught his eye. He amassed a private collection of his own, to the tune of 239 pieces of art and priceless artifacts from 172 institutions totaling over a billion dollars. He was one of the most prolific art thieves in modern history.