The three-part BBC adaption of Agatha Christie’s books sees a family torn apart by the murder of matriarch Rachel (played by Anna Chancellor), and a hunt to find out the identity of her killer.
Tonight’s first part featured many twists and turns and fans are already gripped, however, loyal Agatha Christie fans have been keeping a close eye on the series.
Sarah explained to Digital Spy: “I’ve taken some very clear and quite big liberties, with the story of the novel.
“But I think I've represented the spirit of the novel. I wanted to write something that you think is familiar but it isn’t.”
The writer also revealed that she had been directly contacted by fans of the 1958 novel.Related articles
BBCOrdeal by Innocence: Writer Sarah Phelps explains CHANGES from Agatha Christie books
I think I've represented the spirit of the novel. I wanted to write something that you think is familiar but it isn’t
Ordeal by Innocence show writer Sarah Phelps
Sarah continued: “They've got to feel like they live, and they've got blood pulsing through their veins, and [like] they've got something to say.
“A couple of real Agatha Christie fans have contacted me via Twitter and things like that.
“Real devotees! To the extent that