
6.6
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.
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1Episode 1The Blackwater
53 min
London widow Cora Seaborne relocates to Essex to learn the truth about a rumored “sea dragon.” When a local girl goes missing, fears escalate.
2Episode 2Matters of the Heart
53 min
Cora moves to Aldwinter, but the grieving villagers don't welcome her. Naomi struggles with her guilt about what happened to Gracie.
3Episode 3Falling
45 min
After fishermen claim they were attacked by the serpent, Cora becomes more determined to understand what's in the water.
4Episode 4Everything Is Blue
52 min
Luke throws a birthday party for Cora. During an eventful night, Cora and Will get closer—and Luke notices Stella is hiding something.
5Episode 5I Break Things
51 min
Cora tries to put things behind her, but a chance encounter makes that complicated. Stella gets some bad news.
6Episode 6Surfacing
54 min
Luke processes the incident. Cora has a realization. Will struggles with Stella's illness.

Claire Danes
Cora Seaborne

Tom Hiddleston
Will Ransome

Frank Dillane
Dr Luke Garrett

Clémence Poésy
Stella Ransome

Hayley Squires
Martha
6.6