This mystery has everything: a strange painting, Nazis, art thieves, the French government, and Canadians. The CBC's The Fifth Estate investigative team went down the art world rabbit hole when they began tracing the lineage of "Man Seated with a Cane," a contentious Amadeo Modigliani painting that was sold to a mysterious American in Nazi-occupied France in 1944 for 25,000 francs.Why is this important? Well, the family of Oscar Stettiner, a Jewish antique dealer, claim his shop was raided by Nazis and all of his wares were taken and sold at auction. But the records of what was taken from him are incomplete, stating only that one Modigliani painting was looted. There are no official records of what it depicted.But the Stettiner family believes it's "Man Seated with a Cane," and the team of reporters from the CBC combed through over 60 years of half-truths from art dealers that never existed, which led them to a group of sisters and the final piece of the puzzle: the man who bought Stettiner's Modigliani at auction in 1944 was related to the man who auctioned "Man Seated with a Cane" in 1996. The Fifth Estate makes a nearly-bulletproof case that Stettiner's Modigliani was "Man Seated with a Cane," and because it was seized illegally from him in 1944, it rightfully belongs to his family.