dumbly-dore
It wasn't a surprise when Sadie Black, got sorted into Slytherin. It also wasn't surprising that she had grown up anti-muggle, anti-Gryfindor, and generally anti-everything. Her friends, of course, are like her too, and Sadie loves it. But somebody seems like they want to change that, and team Sadie up with the biggest, most annoying Gryfindors of them all.
This isn't to mention the a certian annoying Mr. Malfloy that her best friend is crushing on big time, Tracey Davis's big mouth and quiet past, Daphne Greengrass's mysterious mother- who seems to know stuff she shouldn't, and generally a lot of trouble- what else would you expect from the highest levels of Slytherin house?