David Hamilton, an incurably ill man, dies suddenly from an overdose of sleeping pills. Homicide detectives try to establish whether it was suicide or murder, and investigations lead them to the Flemington racecourse.
George Mallaby
Det. Peter Barnes
Leonard Teale
Det. Sgt. David Mackay
John Fegan
Insp. Jack Connolly
Lionel Long
Det. Bert Costello