Ghostbusted

Hermione Granger wasn't one given to alarm over ghosts — she had attended a boarding school full of them — but this one was driving her spare. A solution had to be found. It just so happened that it would come from an unexpected source. / Begins just after the Battle of Hogwarts. No pairing. Apprentice Hermione Granger, Severus Snape Lives, Mistakes Were Made.