Imogen Grey and Adrian Miles novels

The body of the head teacher of an exclusive school is found hanging from the rafters in the assembly hall. Hours earlier he'd received a package, and only he could understand the silent message it conveyed. It meant the end. As Exeter suffers a rising count of gruesome deaths, troubled DS Imogen Grey and DS Adrian Miles must solve the case and make their city safe again. But as they're drawn into a network of corruption, lies and exploitation, every...