Wasps' Nest — Agatha Christie

Sitting on the garden terrace of his large house on a summer evening, John Harrison is delighted to receive an unexpected visit from Hercule Poirot. The detective tells him that he is in the locality to investigate a murder but amazes Harrison by admitting that the murder has not yet been committed but that it is better to prevent one happening first. He then cryptically turns the conversation round to a wasps' nest on a tree that he sees nearby and Poirot and Harrison discuss the destruction of it.