When Myrtle is killed, Dumbledore suspects Tom Riddle is to blame after a Ravenclaw prefect shows him evidence Slytherin's monster is a basilisk. Unable to prove his theory, Dumbledore adopts Tom and brings him to Godric's Hollow for the summer with the hopes that either he, or a certain Ravenclaw prefect, can get the truth out of him. Tom Riddle/OC