Heartland

Thanks everyone. I need printed sources because the question setters are wary of online sites where it's hard to verify the quality of info. They won't accept wikis at all which is a shame when there's so much fantastic detail in sites written by people who love the subject. I'm hoping they'll let m...

Does anyone know of any good biographical books that feature the sisters? I've been accepted as a mastermind contestant and I was hoping to have the sisters as my specialist subject but they're a bit iffy because there's no definitive reference works. I know there's a fair bit in The dark reign...By...