Wife 22 by Melanie Gideon

In this contemporary novel, a middle-aged woman named Alice Buckle finds herself at a crossroads in her life, feeling disconnected from her husband and overwhelmed by the demands of motherhood. When she is invited to participate in an anonymous online marriage survey, she becomes "Wife 22" and begins to share her deepest thoughts and feelings with a researcher known only as "Researcher 101." As Alice's virtual correspondence becomes more intimate, she starts to question her own desires and the state of her marriage, leading to unexpected revelations and a journey of self-discovery that challenges her to redefine her understanding of love and happiness.