The Dream: a Hercule Poirot Short Story

Hercule Poirot is reluctant to answer a letter demanding his services from the reclusive and eccentric millionaire Benedict Farley. He's wary but goes to Northway House anyway. Farley wants him to diagnose his recurring dream of death, in which he shoots himself at precisely 3:28. Then, a week after dismissing Poirot, the dream becomes a reality. Each member of the Farley household questioned by Poirot seems to be more puzzled than the one before. Was Benedict Farley’s death a suicide, or were darker forces at work?