Leonie (The Incredible Theft)

In the short story, The Incredible Theft, Leonie was the name of Mrs Vanderlyn's French maid. During the time of the theft of the papers she had been on the stairs and screamed. This had distracted Carlile and caused him to leave the study where the papers were kept for a short time. Leonie claimed that she had seen a ghost. Hercule Poirot questioned her and deduced that she didn't scream because she saw a ghost, but because Reggie Carrington had sneaked up on her and snatched a kiss.

Leonie and this kissing incident is not featured in the film adaptation of the story in Season 1 10 of ITV's Agatha Christie's Poirot drama series.