First broadcast 4th February 1990.

A well-known banker, Mr Davenheim, has disappeared. For Poirot, this is a case to be solved not so much by clues as with "the little grey cells", as he is confined to his flat.

David Suchet as Hercule Poirot
Hugh Fraser as Captain Hastings
Philip Jackson as Chief Inspector Japp
Pauline Moran as Miss Lemon
Kenneth Colley as Mathew Davenheim
Mel Martin as Charlotte Davenheim
Tony Mathews as Gerald Lowen
Fiona McArthur as Martha
Richard Beale as Merritt
Bob Mason as Sergeant
Peter Doran as Policeman
Stewart Harwood as Delivery Man
Jonty Miller as Mechanic
Malcolm Mudie as Chief Engineer
Charles Rayford as Race Spectator
Cy Town as Race Spectator