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
