The Probability Librarian - A Novella of Hidden Lives, Impossible Choices, and Second Chances

Every life you never got to live is filed away in this city, shelved and forgotten - until one filing mistake wakes one of them up. June Vail has spent four years working at the city's best-kept secret: the hidden Bureau that catalogues every version of a life you never got to live. She's good at her job because she never lets herself think too hard about what's inside the folders. Then one exhausted Tuesday, one crossed file, and one impossible warmth beneath her fingertips change everything.
Now two versions of the same man are walking around her city, and only June knows why. She has days to undo a mistake her Bureau has never once faced - before anyone discovers what she did, and decides which one of him doesn't get to stay. But June isn't the only one keeping secrets. Someone inside the Bureau is quietly building a case that has nothing to do with mercy, and everything to do with who's allowed to be real.
As the city outside her window starts unraveling in ways no one can explain, June gets one chance to make an impossible argument to the people with the power to erase a life with a single stamp. She's about to learn that the mistake she made isn't the only one this Bureau has buried - and that some of what she's searching for was never really about anyone else at all. What happens when the person deciding who gets to exist has already decided the answer shouldn't include you?