It’s evident that Poirot doesn’t want Alfred to be arrested for murdering Emily, but it’s not so clear
why he feels this way. Indeed, all signs seem to suggest that Alfred is guilty. And yet, Poirot seems to be
rooting for him to get off the hook, which is why he’s so frustrated that Alfred can’t provide a plausible alibi. Poirot’s agitation in this scene only adds to the novel’s suspense and tension, as readers are forced to wait—alongside Hastings—to discover Poirot’s reasoning for wanting to protect Alfred.