Butcher — Campbell Armstrong

Detective-Sergeant Lou Perlman gets caught up in a gangland takeover in international bestselling author Campbell Armstrong's electrifying thriller

After stepping on too many of his bosses' toes in public, Detective-Sergeant Lou Perlman is put on “extended sick leave” against his will. He is banned from the investigation of the bloodbath that is shaking Glasgow's criminal underworld, where a bizarre, seriously violent man named Reuben Chuck has seized control.
 
But a gruesome discovery in his own apartment launches Perlman back into the game. Soon a simple inquiry becomes fraught with danger and leads him into the terrain of Reuben Chuck.
 
Glasgow is once again a constant presence in Campbell Armstrong's twisting storyline, in which one wrong turn down a dark alley could change a detective's life forever.

Butcher is the 4th book in the Glasgow Novels, but you may enjoy reading the series in any order.