Mr Burt

In the short story The Adventure of the Cheap Flat, Mr Burt was an agent of the United States Secret Service. He came to London to retrieve some secret government papers which were believed to have been stolen by Elsa Hardt, a concert singer who was believed to be an accomplished international spy. Mr Burt makes a brief appearance at the end of the story where he and Japp arrive to arrest Elsa.

Portrayals
Mr Burt was played by William Hootkins in the film adaptation of The Adventure of the Cheap Flat in Series 2 of ITV's Agatha Christie's Poirot. There he was more appropriately an agent of the F.B.I. His quarry had been renamed Carla Romero in the adaptation. Burt believed Carla would try to sell the stolen plans to the Italian government and had Japp and many of his men stake out the Italian embassy.