Harry Potter has just defeated Voldemort and saved the Wizarding World. Before Harry can figure out what he wants to do with the rest of his life, he must first come to terms with all that he has lost. This is the first book in the story of what happened to Harry and the others during the 19 years between book 7 and the Epilogue.
Pulled into an alternate reality where Voldemort still reigns supreme, Harry is expected to turn the tide. With Ginny by his side and no clear way back, Harry has no choice but to do it. But he's done this before so it won't be a problem, right?