Katherine Dunbar begins to think McCandlish might be innocent when the police discover that his wife's cause of death is the same as the Street Killer's victims.
Having seen Veitch speaking to a notorious pimp, McDowell is keen to find out just how much Doctor Sangster knows. The firm faces serious financial difficulties.
Joe Sangster, a doctor at a local health clinic, hires Greg McDowall after one of his clients, a prostitute, dies from a drug overdose he suspects was administered to her.