Cast
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Jean Anderson
Miss Heron
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Elwyn Brook-Jones
Walter Cream
Robert Brown
Alec Lanch
Diane Cilento
Amy Heron
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Selma Vaz Dias
Irma Fornas-Mertz
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Richard Goolden
Ex-Insp. Renishaw CID
Katie Johnson
Mrs. Heron
Mary Merrall
Zoe Ballantyne
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Richard Molinas
Monaco police chief
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Marcel Poncin
Count d'Oznobichine