[s9e1] Five Little Pigs -

Poirot investigates by interviewing the five other people present on the day of the murder:

: Caroline’s younger half-sister, whom Caroline had accidentally disfigured as a child. The Twist Ending [S9E1] Five Little Pigs

: A stockbroker and Amyas’s best friend. In the TV adaptation, he was secretly in love with Amyas. Poirot investigates by interviewing the five other people

: Caroline discovered her sister, Angela, pulling a prank on Amyas earlier that day. When Amyas died, Caroline wrongly assumed Angela had accidentally poisoned him. [S9E1] Five Little Pigs