The Split: Fiona Button explains why viewers will get attached to the characters
Nicola Walker takes on the powerful role of Hannah Sterne, the eldest of three sisters.
The family business - Defoes - is a divorce law firm which Hannah spearheaded with her mother, Ruth Defo (Played by Deborah Findlay).
But when she left to join a large corporate law firm, a schism was created between Hannah, her mother, and her two sisters Nina (Annabel Scholey) and Rose (Fiona Button).
Rose leads a very different life to her sisters, as she shied away from the family business of divorce.
Leading a humble life as a nanny, Rose can be seen trying to keep the peace between her sisters whilst still being treated as the youngest of the three.