Nights in Rodanthe by Nicholas Sparks

Nights in Rodanthe is a novel by American writer Nicholas Sparks in September 2002.
Set in Rodanthe, North Carolina, the story follows the romance of a divorced mother, Adrienne Willis, and a divorced father and surgeon, Paul Flanner. The novel's two main protagonists meet in an inn in Rodanthe and fall in love; however, fate falls upon them when they realize that leaving Rodanthe would mean going back to their separate lives.
Nicholas Sparks based parts of his story on his own life's events, particularly his courting of the woman he married, Cathy Cote. Themes of love and sacrifice are incorporated in the novel. Nights in Rodanthe was adapted into a 2008 film of the same name. The story Nights in Rodanthe begins in 2002 in Rocky Mount, North Carolina. Adrienne Willis, a part-time librarian and divorced mother of three, is helping her daughter, Amanda, cope with depression. Amanda is having problems coping with the loss her husband and is having difficulties raising her two children. In an effort to show that life goes on despite trying times, Adrienne tells her daughter the story of her relationship with Paul Flanner, whom she met in 1988 - a fifty-four-year-old father, a successful surgeon, who had recently divorced from his wife.
While the storm looms, the two characters, the only people at the inn, find compassion in one another and fall in love. After a few days, Adrienne and Paul slowly realize that once they leave, they must return to their separate lives... (Summary by Wikipedia)