Prof. Martineau / Mansel

John Robinson

Guy Thornton

Dermot Walsh

Margaret Thornton

Hazel Court

Yacht Port Manager

Joss Ambler

Dr. Fawcett

Hugh Burden

Peter

Hugh Latimer

Mrs. Manley

Mignon O'Doherty

Mrs. Martineau

Joan Carroll

Mrs. Martineau

Joan Carol

Ron, 2nd Fisherman

Joss Ackland

Coroner

Laidman Browne

Sid, 3rd Fisherman

John King-Kelly

Mr. Leech, Surveyor

Meadows White

Bert, 1st Fisherman

Pat McGrath

Party Girl (Joyce)

Patricia Owens

1st Engineer

Colin Douglas

Party Girl (Vera)

Melissa Stribling

Bernard

Ian Carmichael

Strange Passenger

Geoffrey Dunn

2nd Engineer

Jack Stewart

Thomas Salter (Lloyd's Surveyor)

Anthony Marlowe

Pianist

Anthony Hayes

Steward

Barry Phelps

Police Inspector

Robert Moore

Plain Clothes Man

Ewen Solon

Policeman

Jock Finlay

Mrs. Morgan, Housekeeper

Madoline Thomas

1st Guest

Graham Stuart

2nd Guest

Gordon Bell