| Katie and her grandmother are off to visit the museum again, and tiffs time Katie steps into the Mona Lisa painting to find out what makes her smile. Mona Lisa, it turns out, no longer feels happy because she is lonely, so Katie takes her from painting to painting to try to bring back her smile. They explore several Renaissance masterpieces, and soon the museum is in a muddle. In the end, Katie helps the Mona Lisa's find her smile.
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