Throughout their senior year in high school, Zoe, Maddie, and Angela continue to share "instant messages" with one another about their day-to-day experiences as they consider college, sex, the importance of prom, and the inevitable end of their inseparable trio.

After she dies in a car crash, teenage Samantha relives the day of her death over and over again until, on the seventh day, she finally discovers a way to save herself.

Told from separate viewpoints, this book tells the tale of teens Scam, Crash, Flicker, Anonymous, Bellwether, and Kelsie--all born in the year 2000 and living in Cambria, California--who have superhuman abilities that give them interesting but not heroic lives until they must work as a community to respond to a high stakes crisis.