When You Were Mine: The Novel That Inspired the Movie Rosaline

Seniors Rosaline Caplet and Rob Monteg, neighbors and best friends, have finally become a couple at their Southern California high school, but when Rosie's estranged cousin Juliet moves back into town and pursues Rob in an unstable, needy, and vindictive manner, Rosie starts to worry not just about Rob's emotions, but about his very life.