“One Day” is reminder of living in the now. Not “when I’ll … then I will” kind of thinking. The novel is a story of two people in love with each other who lived their lives in parallel for almost two decades, until they married and lived ever happy until her life was abruptly interrupted by an accident only couple of years into their marriage.
The story line is braided in different years in different location, so I would not describe the reading as relaxing. You’ll have to make a bit of an effort to follow back and forth. It is absolutely worth it. You’ll see.