From breakout thriller writer Paula Daly, the story of a husband and wife and the devious best friend who comes between them.

Natty and Sean have a rock-solid marriage—with two daughters, a successful business, and a beautiful house, they are a model family. When their younger daughter falls ill on a school trip, Natty rushes to her side. Luckily, Natty’s best friend from college, Eve, is visiting and offers to stay with Sean to lend a hand in the household. But Natty returns home to find that Eve has taken to family life a little too well: Sean has fallen in love with her. With no choice but to put on a brave face, Natty attempts to start anew—yet no matter how hard she tries to set herself upright, Eve is there to knock her down again. Then Natty receives a mysterious note that says Eve has done this before—more than once—and the consequences were fatal. On a mission to reveal Eve as a vindictive serial mistress, Natty must navigate through a treacherous maze of secrets and lies that threatens her life and the safety of her loved ones.