Sent back in time by a mysterious person and trapped in the past with a missing Dumbledore and an overbearing, charismatic Dark Lord, they had no idea how much they could dabble with before the world they had known shattered into pieces.

Ultima ratio - the last resort. At last the day of the Final Battle against Lord Voldemort has come. Harry, Ron and Hermione fight bravely against their nemesis - but then something goes wrong. And Hermione finds herself alone in a precarious situation.