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.
Episodes
The Blackwater
London widow Cora Seaborne relocates to Essex to learn the truth about a rumored “sea dragon.” When a local girl goes missing, fears escalate.
Matters of the Heart
Cora moves to Aldwinter, but the grieving villagers don't welcome her. Naomi struggles with her guilt about what happened to Gracie.
Falling
After fishermen claim they were attacked by the serpent, Cora becomes more determined to understand what's in the water.
Everything Is Blue
Luke throws a birthday party for Cora. During an eventful night, Cora and Will get closer—and Luke notices Stella is hiding something.
I Break Things
Cora tries to put things behind her, but a chance encounter makes that complicated. Stella gets some bad news.
Surfacing
Luke processes the incident. Cora has a realization. Will struggles with Stella's illness.
Top Cast
Claire Danes
Cora Seaborne
Tom Hiddleston
Will Ransome
Frank Dillane
Dr Luke Garrett
Clémence Poésy
Stella Ransome
Hayley Squires
Martha
