Harry Potter and the Secret of Durmstrang

AU. Deep inside Durmstrang, an object of great power is hidden, an object one Igor Karkaroff strives to acquire. Easy task, right? Well, not when there's the mysterious reappearance of Harry Potter at your school, an overly interested Albus Dumbledore, a possibly deadly threat and the disapproval of your own staff you also have to deal with.