Sign of Four

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Across
  1. 2. Holmes would rather have him then the whole police force!
  2. 6. Substance Tonga stepped in which helped track his route
  3. 8. Indian fort where Achmet is murdered
  4. 10. Site of the Jack the Ripper murders
  5. 12. Dry-docked ship our heroes chase down the Thames
  6. 16. Convict islands where our criminal spent time
  7. 17. Official in the "grey suit" who loves "stern facts"
  8. 18. Romantic "army surgeon with a weak leg"
  9. 21. Surname of the "sunburned reckless-eyed fellow"
  10. 22. Sholto's lodge
Down
  1. 1. Bartholomew killed with this item
  2. 3. Agreed to Small's freedom then stole the treasure for himself
  3. 4. He writhes his hands in a "perpetual jerk"
  4. 5. Era in 1888
  5. 7. Collection of street urchin 'spies'
  6. 9. The "only unofficial consulting detective"
  7. 11. Frightening native "gnashing his teeth"
  8. 13. Holmes fights crime and restores order - bringing ______ to Victorian society
  9. 14. "Well gloved" lady dressed perfectly!
  10. 15. Mary Morstan's father's rank
  11. 19. Supernatural genre Doyle adds to create fear
  12. 20. Treasure item sent once a year to Mary