The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'FREDA CLARK 30. Lenny's widow. A warm but strong character. Knows exactly what her husband is and what he does. Loves him deeply in the true sense of the word. A realist.
'SENIOR DETECTIVE HARRY BROWN About 40. A seasoned member of the Breaking Squad.
'WHITE 28. Good looking, flashy dresser. Hard, callous, utterly ruthless. He is a very dangerous crim, who, when cornered, never stops thinking of how he can get out of a tight corner, and never caring who gets hurts when he does so.
'JOAN 30-ish. Freda's neighbour. A plump, contented housewife. Knows the Clarks, likes them, knows what they do and accepts it as perfectly normal.
'MRS. JOHNSON 45. Church bazaars, a garden, a gentlewoman. Not an inkling of an idea that her husband is a crim.
'SMOKEY STEVENS 50. A small wiry pro. crim. An old "customer" of Fox's. Proud of his prowess as a safebreaker. He knows Fox is a straight cop, and expects Fox to treat him as a professional.
'DAVIS 40. Shifty. The kind of bloke you couldn't trust as far as you could throw him. Tries to be a smart alec with a loud mouth, but cracks badly when the pressure is really on.
'KEN HUME 35. Forensic man, friendly, explains things to Grey.
'MR. GREY 50. Manager of the supermarket. All "hail-fellow-well-met" type. Finds it difficult to stop talking, thinks the robbery is most exciting and fancies himself as an amateur detective. He calms down a lot after he discovers Lenny's body.
'BOAT YARD OWNER 35. Pleasant, slow-moving, outdoor type.
'JIMMY SMITH 30-ish. Round-faced, smiling aboriginal [sic]. Friendly, down-to-earth.
'DOCTOR Normal-type doctor.
'FIRST HOUSE-HOLDER 25. Young motor enthusiast. Pleasant, average bloke.
'SECOND HOUSE-HOLDER 55. An average bloke.
'JOHNSON 40. Typical commerical traveller type, but not flamboyant.
'LENNY CLARK Small, 30-ish. A body only on the screen, but practically the major character.'