Agatha Christie: The ABC Murders
Episode 2
S1 E2:
Hercule is held in deep suspicion by Scotland Yard and the A.B.C. killer sends more letters promising to spill blood. Against a background of rising xenophobia in Britain, Hercule’s past, integrity, and identity come into question. But a friend from Hercule’s past intervenes and employs him to put an end to the slaughter.