Mysterious people

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Across
  1. 4. you’re solving a
  2. 6. Yang
  3. 7. Yin
  4. 8. non-crackable case
Down
  1. 1. Amazing Doctor of goodness
  2. 2. opposite
  3. 3. Horrible man of evil
  4. 5. Didn’t wait for Mother Nature
  5. 9. Life = …