Why is there an episodes of Black Butler after the episode that ciel dies?

I was watching Black butler [anime] on Netflix it was called Black Butler season one part 2. so i don't no if they mean that that's the second season?. anyways. Ciel i guess dies on episode 12. Or gets his soul taken by Sebastian . Then there is another one episode 13 that has everyone in it. and it said at the end of that one that there is going to be another one . I JUST DON'T understand. I thought he died!