The Fruit Gum Murders — Roger Silverwood

Inspector Angel and his team are faced with a baffling case when a fruit gum found at a murder scene becomes a significant clue in their investigation. The discovery of a hospital porter, also poisoned, indicates that the killer has struck more than once, and Angel is thrown headlong into a world of blackmail and deeply buried family secrets. This is the intriguing 21st title in the highly successful Inspector Angel series.