Light The Blue Paper

The bang is loud in the night. The conspiracy of silence which follows is more sinister. When an explosion destroys Bill Webster's betting shop CID runs up against a blank wall. No clues and there is nobody willing to talk. Webster himself stubbornly maintains it was an accident, but Barlow is convinced there is a connection between the explosion and the fact that Webster intends to compete with his rivals by opening more shops in the area.