Harry Potter and the True Heir of Slytherin

it has been one year since the great harry potter defeated the dark lord he who must not be named! and there is a new transfer student coming to hogwarts just in time for her 5th year. harry potter and all his classmates have been held back a year to make up for lost learning time the past 2 years but something just doesn't feel right, like there is a air of gloom hanging over the grounds and the once energetic and loud hass are just as desolate and dreary as the rest of the wizarding world will the golden trio be able to figure out the reason for the sober atmosphere or will the wizarding world just have to deal with the bleak feeling for the rest of time!