In 1933, retired detective Hercule Poirot starts to receive threatening letters signed "ABC". When he informs Scotland Yard, they ignore his fears, and soon enough, a series of killings begins.
A third murder leads to sensational headlines and ridicule for Poirot and Crome, who discover the connection between the murders and try to use it to work out who will be the ABC killer's next victim.
In the wake of another murder, Poirot and Crome begin to narrow in on the killer.
Some networks have split the 3 original episodes into 4. This is the 4th episode of that set.
