Annie (The Mysterious Affair at Styles)

In the novel The Mysterious Affair at Styles, Annie is one of the two maids of the Styles Court household during July 1916, along with Dorcas. The character is interviewed by Poirot and Hastings, which receive a vital clue. Annie tells them that the cocoa tray of Emily Inglethorp had some "salt" on it which is identified as strychnine by Hastings.

Agatha Christie's Poirot
In the Agatha Christie's Poirot's 103 minute episode, Annie is only seen crying when John Cavendish was wrongfully arrested for Emily Inglethorp's murder. The actress behind the part is not credited.