Knives out

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Across
  1. 3. - Puzzle-solving
  2. 4. - Hint
  3. 9. - Planner
  4. 11. - Puzzle
  5. 13. - Question
  6. 14. - Trickery
  7. 16. - Observer
  8. 17. - Sleuth
  9. 20. - Culprits
Down
  1. 1. - Proof
  2. 2. - Estate
  3. 5. - Reason
  4. 6. - Crime
  5. 7. Herring - Misleading clue
  6. 8. - Concealed
  7. 10. - Excuse
  8. 12. - Investigating
  9. 15. - Suspicion
  10. 18. - Surprise
  11. 19. - Disclose