Linus Lovegood & the Fifth House of Hogwarts

Historical fiction in the Harry Potter universe... In 1863, magical graduate students in Hogsmeade stumble upon evidence of a massive cover-up dating back to the 16th century. Features characters from canon as well as ancestors of canon characters and a boatload of invented. I am new to this field so please forgive me if I've made any egregious mistakes of etiquette or otherwise.