Lizzy Caplan's character has a complicated relationship with her estranged father, played by De Niro. It all added to the experience of working on the gripping new series, writes Esther McCarthy

This interview contains spoilers from all six episodes of "Zero Day," now streaming on Netflix. Lizzy Caplan always knew that her character, Congresswoman and former First Daughter Alexandra Mullen, was behind the catastrophic cyberattack that incited the existential and moral panic that runs through "Zero Day.