When Vincent van Gogh's Portrait of Monsieur Trabuc turns up unexpectedly at the Metropolitan Museum of Art-a $50 million painting shipped from Argentina via UPS, like an ordinary package-the case goes to Clay Ryder, the NYPD Major Case Squad detective assigned to art theft.Ryder discovers that in Paris, late 1944, a Jewish widow accused a German SS officer of stealing the painting. The officer was reported to have died in a car crash at the war's...