I used to have a great textbook that listed all the famous murder locations in New York City, along with where and what they were at the time of publishing.
I once went on one of the tourist bus tours of the city, and one of the park fences (small park, not central) was made out of the weapons and jewelry of the English soldiers after they lost.
Unfortunately, my grandma liked to steal all my books to sell on amazon. That one and a textbook on epistemology burned the worst. I've not been able to find the epistemology book, it was a fantastic explanation at the social friction I tend to bounce off of, I really do disbelieve a lot of the social woo that keeps conversations civil. I'm not saying I'm stiff like a vulcan, but if someone says stupid poo and starts preaching about it, I get a mite tetchy.
I believe the NYC book was called Rotten Apples.
Bingo!
https://www.amazon.com/Rotten-Apples-Stories-Mystery-Present/dp/0345362780Price has come down, she crowed about getting $45 for it.
Just saying it might help your lady enjoy whitechapel if she whet her appetite before hand with a little reading.
Trips are always a lot more interesting when you can get the local flavor rather than the beachside gift shop with overpriced T-shirts.