Sydney Crowther

Crowther sits at the center of the novel's political world, the ranking English official Poirot summons when he needs the state to take the Big Four seriously. His loyalty to Poirot is genuine, but so is his caution: he calls the conspiracy credible yet suspects Poirot 'exaggerates a little,' and his slow, heavy hesitation is the sound of a reasonable man confronting something unreasonable. That measured doubt defines the early arc, where the question is not merely whether the Big Four exist but whether anyone in power will believe it in time.