I read them all (and am the OP about my D reading them). Eventually Holmes falls for her and marries her. But if I remember correctly, there is really no s** (sorry, posting at work smile ), I think a kiss is about it. Although I believe the book that happens in has Russell (the girl) becoming a heroin addict in the hands of evil captors, and Holmes rescues her. There are definitely scary moments in the books. My D was probably 12 when she read them. She is not a particularly sensitive kid in that respect, so it was okay for her. So it depends on your daughter. The newest one just came out yesterday, my D is begging for a trip to the bookstore!