A rising death toll. A city in panic. A young mother is found dead in her home with no obvious cause of death. As DI Hannah Robbins and her team investigate, it soon becomes clear that the woman is the first in a long line of murders by poison. With the body count climbing, and the city of Nottingham in social meltdown, the team finds themselves in a deadly race against a serial killer determined to prove a point. And Hannah finds herself targeting an individual with whom she has more in common than she could possibly know.