centers on Don Gracey, who encounters Summer and her husband Wyn Storm during a thunderstorm in Central Park. After a lightning strike seemingly disrupts their reality, the couple exhibits strange behavior and memory issues, causing Don to take them in and help them navigate their newfound lives. Over the years, Don develops a deep and conflicted love for Summer as she undergoes peculiar changes, including an inexplicable process of aging backward. As Wyn embarks on a quest to understand and possibly reverse this phenomenon, the story delves into themes of identity, time, and the intricate dynamics of love, leading to an astonishing revelation about the intertwined fates of the characters and the implications of time travel. (This is an automatically generated summary.)