Noelle Shepherd is unemployed, living with her parents, and grieving the loss of her beloved grandmother when she discovers decades-old photos of Gram and a smitten man, tucked alongside a love letter. She creates a TikTok to search for the mystery man, which goes viral, and she's shocked when his grandson responds--a man who happens to be her high school nemesis, Theo Spencer.

Noelle refuses to let Theo's annoying accomplishments in adulthood--or his sexy smirk--stand in the way of meeting his grandfather and unlocking the secrets he knew about her gram as a young woman. When she learns that their plans to elope were thwarted, Noelle decides to take the honeymoon road trip they planned but never got to carry out. There's a catch, though: Paul, Theo's grandfather, asks to come with her, and he insists that Theo join them.

It'll be a miracle if they make it through the trip without Noelle throwing Theo out of the moving car--or the bed they end up sharing. As the miles tick by, the tension simmers hotter between them...until she discovers that Theo's hiding a secret that could cause their tenuous relationship to end before it can restart.