Director: Don Taylor.
Lady Dalcastle's two sons could not be more different: the amiable George and the intense Robert have an uneasy, and occasionally violent, relationship.
It is a relationship which has to be questioned when one of them is brutally murdered.
Mrs Logan and Bell Calvert discover the true circumstances of George's murder and learn for the first time the danger presented to Robert by his mysterious friend Gil-Martin.
Gil-Martin's influence over Robert increases, and Robert finds himself cast out by all levels of society.
He gradually comes to realise the terrifying truth of who, or what, Gil-Martin is.
But is it too late?