MISTERY CROSSWORD

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Across
  1. 1. Something strange to solve (7)
  2. 3. Person who might be guilty (7)
  3. 5. Secret agent(3)
  4. 7. Place where someone hides (7)
  5. 8. Unlawful act (5)
  6. 10. Device to secure a door (4)
  7. 11. Something that helps solve a case (4)
  8. 13. Someone who saw a crime (7)
  9. 17. Answer to a mystery (8)
  10. 18. Proof in an investigation (8)
  11. 20. Excuse to prove innocence (5)
Down
  1. 2. What is real (5)
  2. 4. Something kept hidden (6)
  3. 6. Game or challenge to solve (6)
  4. 9. Get away from a place (6)
  5. 12. Person who solves crimes (8)
  6. 14. Dark shape made by blocking light (6)
  7. 15. Talk to get information (8)
  8. 16. Mark left by a foot (9)
  9. 19. An investigation project (4)