Ruff's Uncle MacRuffmantosh is back, and there's no time to waste – A new mystery must be solved! It seems that a sneaky society of cats has been hiding the secret behind the Mona Lisa's smile for over 500 years. MacRuffmantosh has uncovered a secret notebook with details that will reveal the truth. Was the notebook written by Leonardo da Vinci? Of course not! It was written by his dog – DogVinci!!
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