"The Arrangement" is a novel by Sarah Dunn that explores the complexities of modern relationships. The story follows Megan, a woman who enters into a unique agreement with her husband, Tom, allowing them both to explore romantic connections outside their marriage. This arrangement leads to unexpected challenges and revelations about love, commitment, and personal desires. As Megan navigates her new freedom, she encounters various characters who influence her perspective on relationships. The novel delves into themes of fidelity, self-discovery, and the societal norms surrounding marriage, ultimately questioning what it means to be truly happy in a partnership.