Detective Sergeant Dave Slater returns to work after an injury to find himself embroiled in yet another disciplinary shambles. His interrogation at the hands of the aptly named DI Grimm is interrupted, however, when Tinton Police Station is rocked by an explosion. After rushing to the scene, Slater is shocked to find a bomb blast has killed his friend and colleague - who shouldn't even have been in the building in the first place. Vowing to find justice for his friend, DS Slater throws himself into the investigation to find the mystery bomber. But as ever in Tinton, secrets lie barely buried below the surface, and his friend's life may not have been all it seemed. And with so many skeletons in the closet, which one will end up rattling the loudest?