| Lucy Harrison |
|Family|| Andrew West (fiancé) |
Joe Harrison (brother)
|Behind the scenes|
|Appearances||"The Great Game"|
|Portrayed by||Lauren Crace|
Lucy is really upset about her fiancé's death. She tells John that she believes Andrew was a good man and that he would never betray the government.
- Lucy has much in common with both Annie Harrison of "The Adventure of the Naval Treaty" and Violet Westbury of "The Adventure of the Bruce-Partington Plans".