>> i'm the guy that opened up the door. they're obviously going to look at me. >> who else are investigators looking at, and will the artworks ever be recovered? >> whoever has them, just is waiting for the right time. >> it's the $500 million question, who pulled off the greatest art heist in history? i'm randi kaye outside the isabella stewart gardner museum in boston. this is where it all began, the night of march 18th, 1990. there was a house party at the building behind the museum. after midnight, some young men spotted a car with what looked like two boston police officers. they had no idea that these two men weren't really police officers and no clue that just a short time later these men would pull out the greatest art heist in history. >> i come in, clock in, there