Atonement by Ian McEwan

On a summer day in 1935, thirteen-year-old Briony Tallis witnesses a moment's flirtation between her older sister, Cecilia, and Robbie Turner, the son of a servant. But Briony's incomplete grasp of adult motives and her precocious imagination bring about a crime that will change all their lives, a crime whose repercussions Atonement follows through the chaos and carnage of World War II and into the close of the twentieth century.

Paperback, 2002

Goodreads: 3.95