“Love is the greatest mystery.”
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.
1 season · 6 episodes
S1 E1The Blackwater
May 13, 20226.953 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.
S1 E2Matters of the Heart
May 13, 20226.953 min
Cora moves to Aldwinter, but the grieving villagers don't welcome her. Naomi struggles with her guilt about what happened to Gracie.
S1 E3Falling
May 20, 20226.445 min
After fishermen claim they were attacked by the serpent, Cora becomes more determined to understand what's in the water.
S1 E4Everything Is Blue
May 27, 20225.552 min
Luke throws a birthday party for Cora. During an eventful night, Cora and Will get closer—and Luke notices Stella is hiding something.
S1 E5I Break Things
Jun 3, 20226.351 min
Cora tries to put things behind her, but a chance encounter makes that complicated. Stella gets some bad news.
S1 E6Surfacing
Jun 10, 20226.454 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
Gerard Kearns
Henry Banks
Michael Jibson
Matthew Evansford
Caspar Griffiths
Frankie Seaborne
Dixie Egerickx
Jo Ransome
Ryan Reffell
John Ransome
Lily-Rose Aslandogdu
Naomi Banks
Robin Berry
Jonah
