From chapter one:

On a Tuesday in May, in her thirty-fifth year, Rachel shot her husband dead. He stumbled backward with an odd look of confirmation on his face, as if some part of him had always known she'd do it.

He looked surprised too. She assumed she did as well.

Her mother wouldn't have been surprised.

Her mother, who never married, wrote a famous book on how to stay married. The chapters were named after stages Elizabeth Childs, Ph.D., had identified in any relationship that began in a state of mutual attraction. The book was entitled The Staircase and became so successful that her mother was convinced (she'd say "coerced") into writing two sequels, Reclimbing the Staircase and Steps of the Staircase: A Workbook, each of which sold more poorly than the last.

Privately, her mother thought all three books were "emotionally adolescent snake oil," but she reserved a wistful fondness forThe Staircase because she hadn't been aware, when she was writing it, how little she actually knew. She said this to Rachel when Rachel was ten. That same summer, late into her afternoon cocktails, she told her, "A man is the stories he tells about himself, and most of those stories are lies. Never look too closely. If you uncover his lies, it'll humiliate you both. Best to just live with the bullshit."