The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'BOY A wiry, knockabout lad. 13-14.
'JOAN DOBSON The victim. Art Student. An attractive, long-haired, long legged girl. 18-20.
'DAVID GRIERSON The killer. Outwardly a most respectable, moderately affluent accountant. Tall, well-built, fit, sun-tanned. A health and fitness fanatic. Drives a car. Swims well.
'MRS. GRIERSON Complete contrast to her husband. A hypochondriac, left behind by life. 45, but could look 55.
'SALVATORE MANUELLO Prime suspect. Italian. Lithe, light, darkly handsome. Shy. Not too tall. 18.
'LOCAL CONSTABLE Dependable, but not stupid. Promotion has passed him by because he prefers a small country station. First Constable by rank. 35-45.
'MISS ANNABELLE TOMKIN Runs local art shop. Vaguely attractive. Arty-crafty in a 1930's raffia hat, homewoven way, but really quite a genuine person. 50 plus.
'MR. RIGONI Salvatore's uncle. Southern Italian. Short, stocky. A peasant. 40 plus.
'MRS. RIGONI Salvatore's aunt. Southern Italian. Comfortably plump. Something of a matriarch. Rather more emotional than her husband. 40 plus.
'SAM ROSSINI Italian fisherman. A dry character. 40 plus.
'DANNY Italian, operates expresso [sic] machine in coffee lounge. Quick, neat. Somewhat Australianised. 20-25.
'EXTRAS - TWO UNIFORMED POLICEMEN
'ITALIANS - EXTRAS, AT LEAST 8 Varying in age from 16 to 40. Four of them should be similar in build to Salvatore (for line-up).
'WAITRESS (N.S.) Darkly attractive. Slim, sharp-featured. 18-25.
'BROADS, EXTRAS, 2 OR 3 Good-time girls, catering especially for Italians..either very dark or very blonde. 20 - 30.'