One Day — Shari Malin

On the day of his best friend's wedding, Daniel is at a breaking point. His lifelong crush, Grace, is marrying Michael—a man Daniel has always secretly resented, especially after a white-water rafting trip years ago where Michael's accident exposed Daniel's weakness. When Grace brutally rejects his last-ditch plea, Daniel turns to a mysterious device he inherited. It allows him to relive a single day, and he sets its dials to the date of the accident, determined to become the hero he should have been.He succeeds, but at a devastating cost. Paralyzed by his own heroism, Daniel wakes up to a new reality where he is married to a resentful Grace and his best friend, Michael, is gone. In a desperate attempt to fix the misery he has created, he uses the device again—this time to erase himself from their lives entirely. But he soon learns that some destinies, no matter how hard you try to change them, can only lead to tragedy.One Day is a gripping and heartbreaking novel that explores the unintended consequences of second chances and the devastating ripple effects of a single choice.