The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'BARRY TEMPLE 24-25. Murderer. A salesman who has decided that his charm and sense of humour will get him anywhere. Must be attractive and likeable. Well-dressed and with an easy manner. Usually flippant but capable of more serious moments.
'VALERIE KERSTEN 21. A very pretty girl, well-dressed as befits a rich man's daughter; Public School education.
'MARTIN LESTER 24-25. Also a salesman, but of a different type to Barry Temple - more solid, (but not stolid), dependable. The athletic type - tall, good physique. Wears slightly conservative clothes.
'TOM LODER 40-45. A big man, possibly a little over-weight. Very much in love with a much younger wife, and jealous. His business life is a success, though his domestic life isn't. In all, likeable.
'KAY LODER 28-30. Very glamorous - a small-time model with a figure for bikinis. Ambitious, discontented and shallow on the surface, but capable of deeper emotions than she chooses to reveal. Always well-dressed - hot pants, rather kinky gear.
'EDWARD ST. JOHN 60-65. A rather seedy, broken down old gentleman who still retains his good manners and a certain battered charm. Clothes, once good, are frayed and shabby. Very plummy English accent.
'RAY DUNCAN 25. Good looking in a rather flashy way but shifty. Uses his looks to get girls - and money.
'RICHARD EVANS 40-45. Neat, precise, inclined to be fussy.
'MARGARET EVANS 35-40. Pleasant, attractive, submissive with an occasional spark of rebellion.
'MRS. HOVEY 50-60. A tough landlady with no illusuions [sic] and no special liking for the police.
'MAN IN PARK 18-23. Cheerful athletic type.
'ROY HARKER Forensic man.
'BYSTANDERS'.