From Amazon Prime:

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.

From Amazon Prime you can stream the 3 one-hour episodes of this complete story.

John Malkovich  stars as the aging Hercule Poirot in this S L O W moving presentation. “Bizarre” is the adjective that springs to my mind. Eamon Farren portrays the creepy Cust. To give you an idea of “creepy”,  Cust pays a prostitute to walk on his back with stiletto heeled shoes.  You may well be surprised by certain plot turns.

Not a waste of time, but certainly not to everyone’s taste.