In "It's Not What You Think" by Clare Mackintosh, Nadeeka suspects her husband Jamie is having an affair, but when she confronts him at home one night, she finds herself in the midst of a shocking crime scene. With jaw-dropping twists and a clever plot, this thriller keeps readers on the edge of their seats. Praise from Lisa Jewell, Shari Lapena, and others highlights the addictive and unguessable nature of this gripping novel.