It's a truth that the newly unhyphenated Maisie Grey has learned the hard way. After getting rid of her mama's-boy husband, she happily settles down with her teenage son, Tommy. But she's still stuck with the hovering presence of her impossible mother-in-law, Tommy's grandmother, who refuses to exit the family stage gracefully. Trying to keep it together with her own business and a new relationship with a man who still lives in— —his mother's house, Maisie struggles to learn from the MIL-from-hell. She vows that when Tommy brings someone home, she'll be loving, empathetic, and supportive. But then along comes completely unsuitable September Silva—with her too-short skirts, black nail polish, and stay-out-all-night attitude—who is forcing Maisie to take a flinty, clear-eyed new look at what it means to be a mother.