The Nothing Job by Nick Oldham

The new Detective Chief Inspector Henry Christie novel - Reluctantly agreeing to track down three dangerous criminals, DCI Henry Christie's philosophy is that anything that keeps him at the cutting edge of coppering can't be all bad. But then he's asked to close down an investigation into a fatal police shooting, and he uncovers a number of worrying connections. Henry charges headlong into a terrifying conspiracy and finds himself much closer to the cutting edge than even he would have wanted . . .