Megan remembers everything. Absolutely everything. No detail of her life, no piece of information, no matter how small, is ever misplaced. Some people would consider this talent a gift-practically a superpower-but as far as Megan can see, all it does it separate her from the rest of humanity.

Determined to hide her ability at all costs, Megan becomes a champion-level underachiever, turning to alcohol and drugs to calm the constant onslaught of memories.

In an attempt at normalcy, she marries Craig, a pleasant computer programmer, pursues a writing career, and settles into a nice suburban life.

While researching a story about Alzheimer's patients and their families, Megan finds herself fascinated by the disease. While she cannot help but notice and remember everything, the families she interviews include individuals who are losing the ability to make and retain even basic memories.

She also meets Justin, the grandson of one of the women she interviews. With Craig pressuring her to start a family she doesn't want, Megan's self-destructive tendencies kick in. She and Justin start a passionate affair.

When tragedy strikes close to home, Megan's world threatens to come crashing down. It's the kind of disaster you'd like to forget.

Trouble is, Megan can't.