SOMETHING TO HIDE aka Shattered [1972] DVD:

A man having marital problems with his shrewish wife picks up a young, pretty and pregnant hitchhiker. Before he knows it, he's in over his head. The net is cast and the mesh tightens. When the baby, a sickly infant, is born, his ordeal has only begun. With horror he watches, first the events, then his own feeble struggles to escape their gruesome and foredoomed end.

These People Have Something in Common. They Have ... Something to Hide              

CAST:

Peter Finch ... Harry Field
Shelley Winters ... Gabriella
Colin Blakely ... Blagdon
John Stride ... Sergeant Tom Winnington
Linda Hayden ... Lorelei
Harold Goldblatt ... Dibbick
Rosemarie Dunham ... Elsie
Helen Fraser ... Miss Bunyan
Jack Shepherd ... Joe Pepper
Graham Crowden ... Lay Preacher