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Anne Heywood
Tracey Lawrence

Richard Todd
Geoffrey Lawrence

Nicole Maurey
Helen

Jack Hedley
Inspector McInnes

Jeremy Brett
Mullen (The Intruder)

Maurice Denham
Crawford

Patrick Magee
Simmonds

Gwen Watford
Sister Holden

Verina Greenlaw
Selina

Pauline Delaney
Agnes, Selina's Mother