Ryan Foster thought he knew who he was.

Until one night at exactly 2:17 a.m., the electricity goes out, a strange knocking comes from inside his wall, and a black door appears where no door should exist.

Behind it lies a secret buried beneath his city—a machine that has spent years searching through countless possibilities of reality. Soon Ryan discovers impossible versions of himself, forgotten memories, a brother who may not be who he seems, and a past that refuses to remain in the past.

As the boundaries between memory, reality, and possibility begin to collapse, Ryan is forced to face a question far more dangerous than “What happened?”

Who is the real Ryan Foster?

And if every possible life exists somewhere, what makes one of them truly yours?

THE LAST POSSIBILITY is a science-fiction mystery about identity, choice, memory, reality, and the strange possibility that the story of your life may not have been written yet.