A Window to the Past

I was the back-up plan and had been trained as such since the day Voldemort came back in Little Hangleton. The war is lost. Harry Potter is dead, like actually dead, killed by Bellatrix Lestrange, and Lord Voldemort has been crowned the victor. It is now the moment I have been trained for. I must go back to the past and make sure that Tom Riddle never becomes Lord Voldemort.