Samantha is a stranger in her own life. Until the night she disappeared with her best friend Cassie, everyone said Sam had it all – popularity, wealth, and a dream boyfriend. Sam has reappeared, but she has no memory of who she was or what happened that night. As she tries to piece together her former life, she realizes that she no longer wants any part of it. The old Sam took "mean girl" to a whole new level, and it's clear that she and Cassie were more like best enemies. Sam is pretty sure that losing her memories is like winning the lottery. She gets a second chance to be a better daughter, sister, and friend, and she falls hard for Carson Ortiz, a boy who has always looked out for her – even when the old Sam treated him poorly. But Cassie is still missing, and the facts about what happened to her that night are buried deep in Sam's memory.