And Be a Villain — Rex Stout

Madeline Fraser, radio talk show host extraordinaire, had a natural dread of dead air. So when one of her on air guests signed off at the mike after drinking a glass of a sponsor's beverage, it was a broadcaster's nightmare come true. Enter Nero Wolfe. He agrees to take the case, with his sizable fee contingent on his solving the murder. But to Wolfe's surprise, everyone connected to the case now lies in unison about it. And as the portly detective soon discovers, the secret worth lying about only hides another worth killing for...