Suranne Jones reveals that she had to be talked into returning for a second series after feeling that the story had been told.
The unexpected success of the first series led to Suranne Jones receiving her first BAFTA nomination in 2016.
Filmed mostly in Hitchin and Letchworth, Hertfordshire.
BBC announced a second season after the events of the first season.
It aired on the BBC in Britain under the original title Doctor Foster. In America, they aired it with a more wordy title Doctor Foster: A Woman Scorned.