Mystery Vocabulary

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Across
  1. 1. A person who gathers information secretly
  2. 4. A system for sending messages
  3. 7. Unusual or odd
  4. 9. Something kept unknown
  5. 11. A puzzling question
  6. 12. To find an answer
  7. 14. To consider or ponder
  8. 16. Not familiar or known
Down
  1. 2. A game or problem to solve
  2. 3. To look for something
  3. 4. A hint or piece of information
  4. 5. A situation requiring investigation
  5. 6. Concealed from view
  6. 8. A spectral being
  7. 10. To converse
  8. 13. To direct one's gaze
  9. 15. To discover something