The Windsor Knot

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Across
  1. 5. The instrument played by the young Russian pianist found dead.
  2. 6. The amateur sleuth at the heart of the story (Name).
  3. 8. The Queen’s primary residence where the "knot" begins.
Down
  1. 1. The "knot" in the title refers to this item of clothing, found in a suspicious state.
  2. 2. The Queen’s Assistant Private Secretary and "partner in crime."
  3. 3. The specific milestone birthday the Queen is preparing for during the mystery.
  4. 4. The beloved breed of dogs that accompany the Queen through the halls.
  5. 5. The Queen’s husband, who offers gruff but classic support.
  6. 7. The surname of the author who penned this Royal mystery series.