I haven't read that one since I was a teenager or in my tweens, and back then I was oblivious to anything but the most extreme bigotry (I didn't notice the racism in Lovecraft, but I did notice the homophobia in Adams' Horseclans novels).
I've re-read other Christie murder mysteries in recent years, and what struck me was the really nasty classism, more than racism. OTOH, not too many non-whites in her 1920s English villages to be racist about... But the classism just reeked. Servants always portrayed as, well, servile, timid, and stupid; social-climbers were always punished by the narrative--either by being murdered, or by being the murderers, because getting above your station is the worst of all crimes in Agatha Christie's novels.
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I've re-read other Christie murder mysteries in recent years, and what struck me was the really nasty classism, more than racism. OTOH, not too many non-whites in her 1920s English villages to be racist about... But the classism just reeked. Servants always portrayed as, well, servile, timid, and stupid; social-climbers were always punished by the narrative--either by being murdered, or by being the murderers, because getting above your station is the worst of all crimes in Agatha Christie's novels.