I once found a book about

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Across
  1. 3. Man with a stupid mustache
  2. 6. My friend Jack, of London
  3. 8. The only real horror on the list
  4. 9. Need a hand? They have eight.
Down
  1. 1. I don't need Daddy. Who can help
  2. 2. All 10 of the diaries from these explosive personalities.
  3. 4. Were they real or just legends
  4. 5. Pompeii never complained
  5. 7. The only flying mammals