When the
Nazis steal
Leonardo da Vinci's
Mona Lisa, South American art lover Minghetti travels to
Lisbon to spy for the Germans in return for the famous painting. Inept Nazi agents, counterspies, racketeers and multiple fakes of the masterpiece soon confound all attempts. The artist Ganier is murdered. Lady Wellington Smyth is accused. The painting is swapped for a poor copy under Minghetti's nose. ==Cast==