Grande-Bretagne, 1921. Auteure d'un ouvrage de référence en matière de scepticisme et experte en débusquement de faux médiums, la veuve de guerre Florence Cathcart est invitée à enquêter sur les phénomènes paranormaux qui ne cessent de survenir dans un pensionnat isolé. Sur place, l'enseignant Robert Mallory confronte les certitudes de la spécialiste, tout en convenant que les manifestations sont probablement l'oeuvre d'un des jeunes pensionnaires. Maud, la gouvernante, se montre plus circonspecte. Alors que l'établissement se vide à l'approche des vacances, Florence, Robert, Maud et Tom, un pupille orphelin, restent sur place. Au lieu de décroître, les phénomènes gagnent en intensité.

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Rebecca Hall

Florence Cathcart

Dominic West

Robert Mallory

Imelda Staunton

Maud Hill

Isaac Hempstead Wright

Tom

Lucy Cohu

Constance Strickland

Cal MacAninch

Freddie Strickland

John Shrapnel

Reverend Hugh Purslow

Diana Kent

Harriet Cathcart

Richard Durden

Alexander Cathcart

Alfie Field

Victor Parry

Rebecca Hall — Florence Cathcart

Rebecca Maria Hall (born May 3, 1982) is an English actress and filmmaker. She made her first onscreen appearance at age 10 in the 1992 television adaptation of The Camomile Lawn, directed by her father, Sir Peter Hall. Her professional stage debut came in her father's 2002 production of Mrs. Warren's Profession, which earned her the Ian Charleson Award.

Dominic West — Robert Mallory

Dominic Gerard Francis Eagleton West (born 15 October 1969) is an English actor, director, producer, and musician. He is best known for playing Jimmy McNulty in HBO's The Wire (2002–2008) and Noah Solloway in Showtime's The Affair (2014–2019), the latter of which earned him a Golden Globe Award for Best Actor – Television Series Drama nomination, Ebenezer Scrooge's nephew Fred in A Christmas Carol

Imelda Staunton — Maud Hill

Imelda Mary Philomena Bernadette Staunton (born January 9, 1956) is an English actress and singer. After training at the Royal Academy of Dramatic Art, Staunton began her career in repertory theatre in 1976 and appeared in various theatre productions in the United Kingdom.