Six years ago, Brooklyn waitress Bex Callahan was bought out of debt by Grayson Whitlock, a trust-fund heir who assumed she adored him. In truth, Bex treated his discarded watches and wagyu as income, logging every humiliation in “The Taming of Grayson Whitlock: An Observation Log.” After saving two million dollars, she returns his original twenty thousand, blocks him, takes her rescue dog Cash, and moves to a small Hudson Valley town to open a burger shop called Burger Queen. Grayson follows, buys the house next door, cuts off her suppliers, and starts midnight construction. Bex plants a garden, sells burgers, and hoses him out of her yard. When his new girlfriend Blair is exposed and sent abroad, Grayson kneels in the mud to propose. Bex refuses: late love is worthless. She ends up counting change with Cash, eating burgers without checking prices, and living without asking anyone’s permission.