Slow Burner by Laura Lippman

A woman watches her marriage implode over text message and decides that ignorance is not bliss in this bitterly satisfying short mystery by the New York Times bestselling author of Lady in the Lake . nn Liz Kelsey promised herself she’d never again spy on her feckless husband, Phil. But then she discovers a string of suggestive texts on his secret burner phone. Even worse, he’s flirting with the woman who shook their unstable marriage once before. But knowledge is power. What’s more dangerous—what Liz knows or what Phil doesn’t know?