The book: "Flowers in the Attic" by VC Andrews
Your age range please.
From my perspective: this book was everywhere when I was in junior high, and I wanted to know what the fuss was. Given the subject matter it's the only book my mother ever directly told me I wasn't allowed to read.** So I had a friend check it out of the library on her card and smuggled it home. It was certainly interesting, but I didn't love it and never read the sequels. Mom found it while she was cleaning and I got into some trouble for reading it, but mostly we talked about the subject matter and why she had told me not to read it in the first place.
**I was allowed into the adult section of the library after the sixth grade. The only standard book rule in our house was Mom had to know what I was reading before I read it and would occasionally offer advice. (When I wanted to read 1984 in 1984 at age 11, she suggested I wait a few years so I would get it. That seemed reasonable to me and I ended up reading it as a sophomore.) Anything she was nervous about she would either check with the Lit teachers at school (she worked in the school office) or read herself when I finished with it. I unintentionally introduced my mom to a lot of authors and books that way.