attack on hogwarts ( harry Potter new generation fan fic)

Elizabeth is a fifth year Slythern. she's best friends with Harry and Ginny Potters children. she can't wait till James Potter comes to Hogwarts. but something has happened to her potion master. he has gone missing but how fourteen years before Harry Potter had deafeted voldermort. so how could this be happening. could there be a new dark lord or lady on the rise.