group of armed and masked panthers hit this museum in zurich, making off with a monet, a van gogh, a degasd a cezanne. it was the largest art robbery in european history. the last of the paintings was recovered in april 2012 in a dramatic raid captured on videotape. a serbian swat team stormed this house to arrest the men accused of snatching the impressionist works. the cops took a van in for examination and found something hidden in the ceiling. when they pulled it out, they discovered it was cezanne's "boy in the red vest"-- estimated value, $113 million. but nailing a couple of panthers doesn't help the police nearly as much as they would like it to. if one of these guys gets caught, will he squeal? will he give evidence about the other people, his partners? >> glassey: no, there is an omerta between them. >> simon: the omerta really works. >> glassey: the omerta really works, and when we are speaking of the best teams, a lot of them are really friends. that means they grew up together. >> simon: still, since 2007, hundreds of arrests have been made, but those panthers just keep on rep