The mental patient is soon arrested, but not before he has killed the daughter of his former landlady. Gideon wants to congratulate personally the policeman who made the arrest, only to discover it is the same young officer who gave him a summons for his early morning traffic offence. Various jobs then preoccupy the chief inspector while his detectives continue to investigate the bribery case. News then arrives that the suspended policeman has been run down by a car — whose tyre tracks match one used in the earlier payroll jobs. After Gideon visits the dead officer's wife, evidence soon emerges that links the dead detective to a woman, Mrs. Delafield, who went to clubs he frequented.