An English family of six takes in a pregnant woman who disappears shortly after giving birth. They raise the baby girl as their own, but over the years the strange deaths of their children make them consider whether the little girl is more than she appears.

Malcolm Stoddard
as Alan Marlowe

Cyd Hayman
as Kate Marlowe

Angela Pleasence
as The Stranger

Patrick Barr
as Dr. Collins

Wilhelmina Green
as Bonnie

Joanne Boorman
as Bonnie as Baby

Angela Deamer
as Lucy Marlowe

Clarissa Young
as Younger Lucy

Lee Gregory
as Davie

Piers Eady
as Sam