After the Zurich heist of the century, the justice system uses spectacular methods to recover a 100 million painting. Stolen works of art of almost priceless value, a Serbian mafia gang and undercover investigators: the docu-drama series "It happened on... " tells how the Zurich justice system uses cinematic methods to recover two works of art, a 100-million Cezanne and a Degas, which were stolen by armed thieves from the Bührle Museum in Zurich on February 10, 2008. An undercover investigator infiltrated the Serbian mafia gang, invitations to a luxury weekend in St. Moritz followed and the stolen paintings were finally returned thanks to a faked deal worth millions.