Work Together

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Across
  1. 1. Seventh element on the periodic table
  2. 4. Author of The Northern Lights, Phillip ___
  3. 5. Title of the fourth chapter of The Northern Lights, The ___
  4. 10. Partners in puzzle solving
  5. 11. Nitrogen and 3 hydrogens
Down
  1. 2. Colour opposite red on a standard Rubik’s cube
  2. 3. What to do in a locked room
  3. 6. Where Hobbits live
  4. 7. Things that infect
  5. 8. Gandalf, Harry
  6. 9. Three book series