I have seen the Swedish film a couple of times, which was great.
I also saw the US remake, which wasn't.
And unsurprisingly the book is also great, even if you know the story already.
I loved the writing, the people and the setting.
While the films only touch the surface, the book can easily dive into the characters, relationships and small details.
I am a bit of a Nordic Noir fan and this is probably one of the best.