India Black and the Widow of Windsor

Black is back-Her Majesty's favorite spy is off to Scotland in this new adventure to ensure the Queen doesn't end up getting killed.
When Queen Victoria attends a séance, the spirit of her departed husband, Prince Albert, insists she spend Christmas at their Scottish home in Balmoral. Prime Minister Disraeli suspects the Scottish nationalists plan to assassinate the Queen-and sends the ever resourceful India and the handsome British spy, French, to the Scottish highlands.

French will take the high road, looking for a traitor among the guests-and India will take the low road, disguised as a servant in case an assassin is hiding among the household staff. India is certain that someone at Balmoral is determined to make this Her Majesty's last Christmas...