In 1905, a man travels to a remote island in search of his missing sister who has been kidnapped by a mysterious religious cult.
Dan Stevens
as Thomas Richardson
Michael Sheen
as Malcolm Howe
Lucy Boynton
as Andrea
Mark Lewis Jones
as Quinn
Bill Milner
as Jeremy
Kristine Froseth
as Ffion
Paul Higgins
as Frank
Richard Elfyn
as Charles
Catrin Aaron
as Elaine
John Weldon
as Lonely Passenger
Ross O'Hennessy
as Suspicious Passenger
Gareth Pierce
as Man #1
