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The first investigation of Max, the main mouse hunter at the Royal Theatre! Madame Emeralda, the famous opera singer, has been behaving very strangely lately, and only the clever cat with the fluffy tail and detective skills seems to understand what's going on... So, hold your breath as Max jumps from roof to roof! Tremble when he rushes to the rescue in the middle of the night! And APPLAUD the cat who brilliantly solved the mystery!