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You can stream The ABC Murders (2018) on Amazon Prime with a subscription.

1933. Hercule Poirot, older and greyer, receives letters threatening murder. The sender signs themselves only as “A.B.C.” When he takes the letters to the police looking for help, Hercule finds all his old friends have moved on. But soon there is a murder and the once-great detective must take matters into his own hands.

A series of cryptic letters signed only by A.B.C. signals a calculated spree of killings that leaves a fading Hercule Poirot isolated from his usual allies. This aging detective must rely on his own sharp instincts to catch a killer who strikes with terrifying, rhythmic precision.

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