Adaptation of J. Courtney Sullivan's forthcoming novel, which is officially described as follows: Evelyn has been married to her husband for forty years—forty years since he slipped off her first wedding ring and put his own in its place. Delphine has seen both sides of love—the ecstatic, glorious highs of seduction, and the bitter, spiteful fury that descends when it’s over. James, a paramedic who works the night shift, knows his wife’s family thinks she could have done better; while Kate, partnered with Dan for a decade, has seen every kind of wedding—beach weddings, backyard weddings, castle weddings—and has vowed never, ever, to have one of her own. As these lives and marriages unfold in surprising ways, we meet Frances Gerety, a young advertising copywriter in 1947. Frances is working on the De Beers campaign and she needs a signature line, so, one night before bed, she scribbles a phrase on a scrap of paper: “A Diamond Is Forever.” And that line changes everything.