Harry Potter again

[georgit79]

I'm about a quarter of the way through the latest Harry Potter installment, and I was wondering if anyone could give me a quick recap of what happened in the last book. I have read it, but about 2 years ago now and I don't want to have to stop reading this one and re-read the last one again so I know what's going on! Just remind me briefly what happened, who killed Sirius and what the Order of the Phoenix actually is. And who's Tonks again?

Thanking you kindly.

[Xollob]

Wikipedia has some excellent articles. See here for summary of HP5, description of the Order of the Phoenix, and a biography of Nymphadora Tonks.