Sammie McCoy is a girl with a plan: graduate at the top of her class and get out of her small town as soon as possible. Nothing will stand in her way - not even the rare genetic disorder the doctors say will slowly steal her memories and then her health. So the memory book is born: a journal written to Sammie's future self, so she can remember everything, from where she stashed her study guides to just how great it feels to have a best friend again.
"Don't be like me, have tissues handy."
Bryce remembers it like it was yesterday: the scent of chlorine, the blinding crack and flash of pain, blood in the water. When she wakes up in the hospital, all Bryce can think of is her disastrous Olympic diving trial. But everything is different now. Bryce still feels 17, so how can her little sister be 17 too? Life went on without her while she lay in a coma for five years: Her best friend and boyfriend have just graduated from college. Her parents barely speak.
Twin sisters Kelsey and Michelle Maxfield look identical - but they couldn't be more different. Kelsey is the captain of the dance team and loves her cute college boyfriend, Davis. Michelle is a free-spirited artist and flits from one guy to the next, the latest a soldier recently deployed to Afghanistan. Despite their differences, Kelsey and Michelle can't live without each other - until, in an instant, everything changes.