A young man and his three younger siblings are plagued by a sinister presence in the sprawling manor in which they live.
George MacKay
as Jack Marrowbone
Anya Taylor-Joy
as Allie
Charlie Heaton
as Billy Marrowbone
Mia Goth
as Jane Marrowbone
Matthew Stagg
as Sam Marrowbone
Nicola Harrison
as Rose Marrowbone, Mother
Kyle Soller
as Tom Porter
Tom Fisher
as Simon Fairbairn, Father
Myra Kathryn Pearse
as Molly
Paul Jesson
as Doctor
Robert Strange
as Monster
Laura Brook
as Thelma (uncredited)
