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udrey McMurray, a rally driver and property owner, may appear to be a philanthropist but her ruthless treatment of her tenants has caused Harriet Welsby's husband to kill himself whilst she openly cheats on her husband Walter with young mechanic Gary Bakewell. Audrey is killed in a hill climb after somebody tampers with her car's brakes and Harriet is arrested after threatening her. Then Gary confesses but Father Brown is convinced that Walter and his wife's secretary Phyllis, who are lovers, are the culprits though he has difficulty in persuading Sullivan to let him ensure that justice is done.

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