Sly Riddle is the granddaughter of Voldemort. Voldemort, whom of which everyone believes is dead, is not. He quit. He quit trying to beat Harry and went off to live with the Malfoys' .
Now Sly is going to take over... maybe... there is a new hat - and it is not to sort you. It's to give you your one true love. Henry the new headmaster wanted to let all sixth years try it out... and so they do - trying out to be a family person.
Sly was never bothered by one day... possibly... marrying her cousin Scorpius... but when the hat places her with one cousin she can't stand things go down hill for the canny Slytherin and fast.
Will Sly become the next Voldemort - the next Queen - or will her unlikely cousinly match change her for the better... before bad can happen?
(READ Jessica Riddle first on my other account AllisonHance, thanks.)