The Dark Lord's Playbook of Nefarious Misdeeds

Albus Dumbledore had a plan, it was a smart plan, a good plan, some say a great plan- to imprison the Dark Lord once and for all. He had used a page straight out Tom's playbook, except it all went to hell when Hermione got sucked in with him. Now they are stuck together somewhere outside of time and space. Can they survive together while figuring out how return home? AU