Peter Oliver Barstow was playing golf on a Sunday afternoon in June, 1933, when he complained of a bite from a wasp or hornet. An almost invisible puncture wound was observed on his chest, but he felt no ill effects from the bite, whatever it had been. Thirty minutes later he collapsed and died of an apparent heart attack. But when the incident came to Nero Wolfe's attention, he proved to police that it was murder, the work of a subtly clever killer who had killed twice by the same method, and who Wolfe would now bait into trying the method again...on Wolfe himself.

Also published as Meet Nero Wolfe and Point of Death.