In Susan Mallery's heartwarming tale, three women, Heather, Daphne, and Tori, grapple with the complexities of life's transitions and the power of enduring friendships. Heather, clinging to a semblance of contentment, confronts the emotional tumult of her ex-partner's new relationship while reaching out to a stranger who may reveal family secrets. Daphne battles the fracture in her marriage, seeded by disagreements over parenthood, yearning for a return to intimate connection. Tori, suppressing a burgeoning love for a close relation, walks a fine line between protecting her circle of trust and pursuing romantic fulfillment. 'The Happiness Plan' is an exploration of the courage it takes to open one's heart and the strength found in the bonds of female friendship.