When Y/N arrives a day early at a secluded Malibu beach house to visit her cousin Liam Payne during a rare One Direction break, she expects a quiet evening alone in the empty estate. Instead, she accidentally walks out to the infinity pool and startles Niall Horan, who has also arrived ahead of schedule to escape the spotlight. Mistaking her for a trespassing fan or paparazzi, Niall is initially guarded, but once the hilarious cousin confusion is cleared up, the two find themselves stuck together for twenty-four hours before the rest of the band arrives—setting the stage for a summer romance fueled by sun, jet lag, and instant chemistry.