We started on "A Study In Scarlet" from an annotated collection (wonderful-- I'll get that title back here) but dd1 seemed to lose interest. I thought perhaps because Hound was so different from these. We took a break from Sherlock Holmes and dove into Encyclopedia Brown. DH loved these as a kid, and apparently there are dozens more since then.
Fast forward a few weeks, and I see Scarlet sitting in the graphic novels section. Even though I tend to reach for the classics first before the graphic versions, I thought this might pique her interest. She says she's not interested. But, a couple of days later, she is looking through it on the couch, and finally she clues me in on what she's been thinking: "Mom! Sherlock Holmes doesn't die at the end!" I was surprised. I know there was a "last" story where the detective dies, and she thought this one was it. No wonder she had been reluctant. She wanted to read the book (we did) and then asked for both the Jeremy Brett movies (we have since seen 4 out of the 5 in the collection) and asked for the annotated book back, which which was awesome because it included pictures of the places and things mentioned in the story.
I also happened upon a Hercules Poirot movie with David Suchet, and I brought it home just in case. She liked it, after I had sat down with her to watch with her. It was definitely less action-oriented than she preferred, but she always has had an amazing patience for more mature content in books and movies. Then we tried watching Albert Finney play a very different Poirot in Murder on the Orient Express. We had fun comparing the two. Finally, I ordered the first Poirot mystery The Mysterious Affair at Styles, in part so we could decide which actor we liked better as the detective. Now we are halfway through, I can't quite decide!
So, here we are-- we haven't gone wild with Sherlock Holmes as I expected, but mystery is turning out to be quite the favorite genre at the moment.
I highly recommend the graphic novels I mentioned upthread. They stay true to the story and were very engaging.