From #1 New York Times bestselling author Lev Grossman comes a magical-realist romance that turns the Groundhog Day premise inside-out and upside-down--coming soon to Amazon as a major motion picture. Mark is 17-years-old and trapped in a time loop, and that's just fine with him. It's summertime and he's spending this one infinitely repeating day reading his way through the town library. Then he discovers someone else in the loop with him: the brilliant, haunted Margaret. Together Mark and Margaret set out to find every wonderful, amazing, perfect thing that happens in that one day--a journey that will take them to the dark secret that waits at the very heart of their endless day.  Thrilling, funny, and deeply romantic, this novella is perfect for fans of John Green, Nicola Yoon, and Jandy Nelson.