: While Alexander Bonaparte Cust is initially suspected, Poirot ultimately exposes Franklin Clarke as the true mastermind behind the murders.

The first episode of Series 4 of , titled " The ABC Murders ", features David Suchet as the iconic detective Hercule Poirot.

Originally broadcast on January 5, 1992, the feature-length episode follows Poirot as he tracks a serial killer who taunts him with letters and selects victims in alphabetical order. Key Feature Details