If you type 'Harry Potter' and synopsis into a search engine, you'll get the result you need.
However, I side with China Doll here. There are those who think Rowling's the best writer since Dickens and those who know better, and it's not fair to coerce anyone into reading anything. It's the quickest way to turn someone off a particular author and off reading in general.
I'd love it if you all went out and read Dickens' works which, as you describe HP, need to be considered in their wider context in order to be able to enjoy any one title. But it's not likely to happen. I came to Dickens by choice, years after a teacher said I didn't have to, and that's how you enjoy an author best.