The Darkness Within

AU. Longfic When Teddy's godmother is murdered at the BOH, her husband Ollie is desperate by any means to bring her back and resorts to making a deal with Death himself. Lupin and Tonks go back in time to stop him from changing fate. As a result of dabbling in magic she doesn't understand, she and Remus Lupin are sent to the past with a Time-Turner, but can they change their fates?