Adapted from Sarah Perry's 2016 novel of the same name, The Essex Serpent follows the recently-widowed Cora (Knightley) who relocates from Victorian London to a small village in Essex after escaping her abusive marriage.
In her new setting, Cora becomes intrigued by a local superstition that a mythical creature known as the Essex Serpent has returned to the area.
The novel is set in the year 1893 and begins with the description of a death, which is later attributed to a mythological creature.
The series will be directed by Clio Barnard (Dark River), while Anna Symon (Mrs Wilson) is on board as the writer.
Knightley will also executive produce the project, alongside Barnard, Symon, Jamie Laurenson, Hakan Kousetta, Patrick Walters, Iain Canning and Emile Sherman. Andrea Cornwell will serve as producer.
This is the second new series Knightley has lined up this year, with the actress also set to star in Hulu's adaptation of The Other Typist.
Based on the Suzanne Rindell book of the same name, The Other Typist is a suspense-thriller set in New York during the height of the prohibition era.
It follows a "prim, unworldly police department typist named Rose who is drawn into the shady world of her glamorous new co-worker Odalie (Knightley), but when the ultimate crime is committed, it's uncertain which of the two women was the more treacherous" (via Deadline).
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