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. It's where she'll record every perfect detail of her first date with longtime-crush Stuart, and where she'll admit how much she's missed her childhood friend Cooper. The memory book will ensure Sammie never forgets the most important parts of her life-the people who have broken her heart, and those who have mended it. If Sammie's going to die, she's going to die living.