DI Liam McLusky, freshly transferred from Southampton to Bristol and just recovered from an injury in the line of duty, has no time to settle in before catching a major case. Everyday objects that have been transformed into explosive devices are being left across Bristol, maiming or killing those who pick them up. McLusky must figure out who the killer is, while navigating the fraught internal politics of his new post. Meanwhile, an ex-partner moves into the city to study-and keep tabs on him.