Mrs Everard

In the short story The Kidnapped Prime Minister, Mrs Everard was an aunt of Captain Daniels. She had a house at Hampstead and Poirot later concluded that the kidnapped Prime Minister David MacAdam was being held there. After she had been arrested, Poirot told Hastings that she was Daniels' "so-called Aunt". In fact she was a German spy named Frau Bertha Ebenthal, someone whom the police had been looking for for a long time.

Portrayals
Mrs Everard is not featured in the film adaptation of The Kidnapped Prime Minister in Series 2 of ITV's Agatha Christie's Poirot.

In the NHK anime adaptation The Disappearance of the Prime Minister, Frau Eberthal does appear and was a notorious German spy just like in the original. Here she is disguised as the maid in a large house in Windsor. The Prime Minister was being kept locked in a cellar with O'Murphy. After being captured by Poirot and the police, Eberthal made a full confession. The voice actress behind the character is not credited.