Nero Wolfe needs a case and fortunately a murder occurs right on the radio for Wolfe to solve. One of the guests on the Madeline Fraser radio program has been poisoned. At first it looks like the murderer may have killed the wrong person but Wolfe isn't so sure. So he offers the host, the station, and the sponsors (the victim was killed with poison placed in a sample of the soda of one of the sponsors) for the opportunity to hire him to solve the case and they all jump at the chance.
In a big case like this, Inspector Cramer is involved and he is very unhappy. His investigation is going nowhere and when Wolfe starts looking into the case he quickly discovers that everyone is lying, even those it would seem have no reason to lie. I'll admit that I was left spinning with no clue as to who the culprit could be. But I also admit that figuring out who did it wasn't what kept me reading.
As always, it is the dialog that makes the story. Whether it is between Archie and Wolfe, Archie and the suspects, or Archie and the police, it is always fun.
The victim (Cyril Orchard) has been killed by cyanide in a bottle of a soda called Hi-Spot. Wolfe and Archie are working out the mechanics of the killing with samples of Hi-Spot.
Archie starts:
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"If Orchard had never never drunk Hi-Spot before he wouldn't know whether it tasted right or not, and even if he didn't like it, they were on the air and just for politeness he would have gulped some down. Anyway he drank enough to kill him, so what does it matter what we think?"
"He may have drunk it before. Anyway, the murderer would have had to assume that he might have. Would the difference in taste be too great a hazard?"
"I see." I sipped. "Not so bad." I sipped again. "The only way to really tell is to drink this and then drink some cyanide. Have you got some?"
"Don't bubble, Archie."
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Even Fritz gets into the act in this one:
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Wolfe put his glass down after two little tastes [of Hi-Spot]. "Good heavens. What the devil is in it, Fritz?"
Fritz shook his head. "Ipecac?" He guessed. "Horehound?"
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The truth is that Stout knew how to make his characters unique and interesting and the actual mystery is almost irrelevant.