The Red Box by Rex Stout

Murder by chocolate? That’s the premise Nero Wolfe must operate from when a beautiful woman is poisoned after indulging in a box of candy. It’s a case that the great detective—no stranger himself to overindulgence—is loath to take for a variety of reasons, including that it may require that he leave his comfortable brownstone. But he and Archie are compelled by a mystery that mixes high fashion and low motives…and a killer who may have made the deadliest mistake.