I am very surprised and disappointed to see this book rated "on" for kids as young as 15. I read it a few years ago and would not recommend it for anyone under 18 years old. It is about a young man and a young woman on their graduation day from university. They "hook-up" that night, and form a strong bond. The plot follows them on that same date for 20+ years as they go through different phases of life as well as relationships with other people. The themes are mature, including sexual promiscuity, alcohol abuse, and poor decision making. There are some unsettling plot twists.