Julian Fellowes examines the unsolved murders of three members of the same upper middle-class family living in 1920s Croydon, who died within a year of each other from arsenic poisoning.
Directed byDelyth Thomas
Written byJulie Dixon, Julian Fellowes
CountryUK
Runtime60 min
On screen
Julian Fellowes
Jean Marsh
Stella Gonet
Richard Lumsden