London widow Cora Seaborne moves to Essex to investigate reports of a mythical serpent. She forms a surprising bond of science and skepticism with the local vicar—but when tragedy strikes, locals accuse her of attracting the creature.

Claire Danes

Cora Seaborne

Tom Hiddleston

Will Ransome

Frank Dillane

Dr Luke Garrett

Clémence Poésy

Stella Ransome

Hayley Squires

Martha

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